The potential energy at that point is 648 J.
What is her potential energy?We have to note that by the use of the law of the conservation of the mechanical energy that energy can not be created or destroyed but that the energy can be converted from one form to the other.
We now know that the total energy of the system is; 900 J + 300 J = 1200 J
It then follows from the law of the conservation of the mechanical energy that this total energy must be constant.
Potential energy at that point = 1200 J - 552 J
= 648 J
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Use the following information to answer questions 2-4. Two people are playing a game of
tug-of-war with the rope attached to a mass of 25 kg at the center. The person pulling to
the left pulls with a force of 20 N. The person pulling to the right pulls with a force of 10 N.
2. Which direction will the 25 kg mass move?
a. Left
b. Right
C. It will not move
How do you know?
What will the velocity of the mass be after 1 second?
What will the velocity of the mass be after 2 seconds?
The direction in which the 25 kg mass will move is to the Left. The correct option is A.
This is because the force pulling to the left is greater than that to the right.
The velocity of the mass after 1 second will be 0.4 m/s
The velocity of the mass after 2 seconds will be 0.8 m/s
What is the net force on the mass of 25 kg?The net force o the mass of 25 kg is given below:
Net force = 20 N - 10 N
Net force = 10 N
The velocity of the mass is given by the formula below:
Velocity = net force * time / mass
velocity after 1 second = 10 * 1 / 25
velocity after 1 second = 0.4 m/s
velocity after 2 seconds = 10 * 2 / 25
velocity after 2 seconds = 0.8 m/s
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A student was riding his bicycle from north to south at a speed of 5 m/s when it started to rain. If the rain was falling vertically downward with a
velocity of 10 m/s, in which direction should he hold his umbrella?
Answer:
The student should hold his umbrella at an angle facing south-west.
A 0.10 kg ball traveling at 9.6 m/s to the north collides and bounces off a second 0.12kg ball that is traveling 7.6 m/s in the opposite direction. If the 0.10 ball travels at 0.30 m/s to the south after the collision, what is the velocity of the 0.12kg ball after the collision?
Answer:
0.65 m/s NORTH
Explanation:
North is +, south is -
let V = velocity of the 0.12 kg ball AFTER the collision
Law of conservation of momentum (P = mv) states that total momentum before the collision must equal total momentum after the collision.
(0.10 kg)(9.6 m/s) - (0.12 kg)(7.6 m/s) = -(0.10 kg)(0.30 m/s) + (0.12 kg)(V)
Before → After
0.96 kg·m/s - 0.912 kg·m/s = -0.03 kg·m/s + 0.12 kg(V)
0.048 kg·m/s + 0.03 kg·m/s = 0.12 kg(V)
0.078 kg·m/s = ·0.12 kg(V)
V = 0.078 kg·m/s / 0.12 kg = 0.65 m/s NORTH
1-What is the modern periodic table?
2-Compare and contrast the periods and groups of the modern periodic table.
3-In the modern periodic table shown in Figure
1 above, find the element named lead (Pb). How many protons do atoms of lead have? To which class of elements does lead belong?
4-Which groups of the modern periodic table contain elements that are classified as metalloids?
Modern periodic table is created by Mosely and he classified elements based on their atomic numbers. The vertical columns in the table are called groups and the horizontal lines are called periods.
What is periodic table ?Periodic table is the classification of elements into different groups and periods. Groups are vertical columns in the table, containing elements with same number of valence electrons and similar chemical and physical properties.
Periods are horizontal rows in periodic table. From left to right the atomic number of elements increases by one. Lead is 82nd element in periodic table and it is placed in the 14th groups.
Metalloids are elements showing properties of both metals and non-metals. Metalloids are classified in group 14 as well in group 13.
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An ultracentrifuge accelerates from rest to 9.91×105 rpm
in 2.35 min
. What is its angular acceleration in radians per second squared?
The angular acceleration is 4.2 * 10^5 rpm^2.
What is the centripetal acceleration?Centripetal or angular acceleration is the acceleration of an object moving in a circular path, directed towards the center of the circle.
It is equal to the square of the velocity of the object divided by the radius of the circular path. Centripetal acceleration is required to maintain the circular motion of an object and is provided by a force, such as tension or gravity, acting towards the center of the circle.
We know that;
α = ω2 - ω1/t
α = angular acceleration
ω2 and ω1 final and initial; angular accelerations
t = time taken
We know that;
ω2 = 9.91×10^5 rpm
t = 2.35 min
α = 9.91×10^5 - 0/2.35
= 4.2 * 10^5 rpm^2
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Please help ASAP label the correct numbers and how to describe the earth’s atmosphere heated by greenhouse effect.
The greenhouse effect is the mechanism by which radiation from a planet's atmosphere warms the planet's surface to a certain temperature.
What is greenhouse effect?When heat from a planet's host star passes through its atmosphere and warms the planet's surface, the process is known as the greenhouse effect. The way that "greenhouse gases" trap heat near to the Earth's surface is known as the greenhouse effect. You may think of these heat-trapping gases as a blanket keeping the Earth warmer than it otherwise would be.
When Earth's atmosphere's gases capture the heat from the Sun, the process is known as the greenhouse effect. Earth becomes significantly warmer as a result of this process than it would be otherwise.
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1.Copper is wrapped with rubber when used in electric wiring. What describes rubber as a material? (1 point)
Responses
superconductor
electromagnet
insulator
conductor
2. Which material provides resistance to the flow of electrons? (1 point)
Responses
silver
saltwater
copper
salt crystals
3. The set up for a science experiment uses a battery, light bulb and copper wire. Which material can be connected to copper wire and a battery to light up the bulb?(1 point)
Responses
nylon string
aluminum foil
plastic straw
rope
4. An electrician wears rubber gloves when working on electrical wiring. What is the purpose of the rubber gloves? (1 point)
Responses
to protect hands from being punctured or cut
to increase the temperature of the hands
to prevent electric shock by restricting the flow of electrons
to allow more electrons to pass through.
5. Why is metal a good conductor? (1 point)
Responses
Its valence electrons flow freely through the material.
It has a higher restriction for moving electrons.
Its rigid structure creates a strong bond among electrons.
It has a solid and compact material.
Rubber is not conducting and is called an insulator. Insulators provide resistance to the flow of electrons. Aluminum foil can be used to the copper wire to light up the bulb.
What are conductors ?Based on the conductivity, there are three types of materials namely, conductor, semiconductors and insulators. Conductors are able to allow the flow of free electron through them thus conduct electricity at room temperature.
Semiconductors only conduct at high temperature and insulators does not conduct at any temperature. Rubber is an insulator and thus used as protecting gloves for hands to prevent electric shock.
Salt crystals in the solid state are not conducting. But the salt solution is conducting due to the presence of ions.
The material which can be used connected to copper wire and a battery to light up a bulb is aluminum foil. Metals are good conductors because, its valence electrons flow freely through the material.
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Rubber, which is not conducting, is referred to be an insulator. Providing barrier to the movement of electrons is an insulator. Copper wire can be wrapped in aluminum foil to light the bulb.
How do conductors work?Three different categories of materials—conductors, semiconductors, and insulators—are categorized according to their conductivity. At normal temperature, conductors can flow free electrons through them and conduct electricity.
Insulators do not conduct at any temperature, while semiconductors only do so at high temperatures. Rubber acts as an insulator, making it ideal for use as hand protection against electric shock.
In the solid state, salt crystals are not conductors. But because ions are present, the salt solution conducts.
Therefore, Rubber, which is not conducting, is referred to be an insulator. Providing barrier to the movement of electrons is an insulator. Copper wire can be wrapped in aluminum foil to light the bulb.
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A robot is being built using two 12 Volt batteries connected in series. What resistance should be used in the circuit if the motors need 2.5 Amps to work correctly?
The static values of circuit components, current rates, voltage sources, and voltage drops can all be verified using Ohm's Law.
What is Ohm's law?A test instrument may indicate that resistance has dropped or voltage has increased, resulting in a high-voltage condition, if it detects, for instance, a higher than usual current reading. This can point to a supply or circuit problem.
A lower than usual current reading in a direct current (dc) circuit could indicate that the voltage has dropped or the circuit resistance has risen. Poor or loose connections, corrosion, and/or broken components are potential sources of higher resistance.
Electrical current is drawn by the loads of a circuit. Any type of component, including small electrical gadgets, computers, home appliances, or a sizable engine, can be a load.
Therefore, The static values of circuit components, current rates, voltage sources, and voltage drops can all be verified using Ohm's Law.
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A displacement-time graph is drawn below.
Displacement (m)
80
5
12
20 Time (s)
Find the displacement for the whole journey.
The total displacement of the journey is 80 m.
What is the displacement?Displacement is a vector quantity that describes the change in position of an object from its initial position to its final position in a given reference frame.
It is equal to the difference between the final position and the initial position of an object and is commonly used in physics and engineering to describe motion. Displacement is usually measured in units of length such as meters.
The graph can show us the that point of the highest displacement is 80m.
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Please help me, image has question. [50 PTS]
Answer:
Attractive, repellent, electric fields so D
Explanation:
Attractive, repellent, electric fields.
What is Electric fields?
The physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them, is known as an electric field (sometimes referred to as an E-field).
It can also refer to a system of charged particles' physical field. Electric charges and time-varying electric currents are the building blocks of electric fields.
Electrical technology makes use of electric fields, which are significant in many branches of physics. For instance, in atomic physics and chemistry, the electric field acts as an attracting force to hold atoms' atomic nuclei and electrons together.
Therefore, Attractive, repellent, electric fields.
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Dose anyone one have a finished copy I can copy off of
A magnetic field is a field that explains how magnetism affects an item in space. The strength of the electric force at any particular place in space is what is known as the electric field. The rate at which a charge travels through a space is called current.
What is Electric fields?From electric charges and shifting magnetic fields, electric fields are created.
There will always be an electric field connected to an electric charge or a group of charges. Any charged object placed in this field will experience an electrostatic force as a result of how the field and the charge of the object interact. The force that would be felt by a positively charged particle if it were present at that precise location is represented by field lines.
Electric charges can move in response to a shifting magnetic field. Inducing electric currents in wires via this phenomenon is a typical practice in electric generators. By altering the magnetic field more drastically or by coiling the wire to expose more of it to the changing magnetic field, the induced current can be raised.
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A 19 kg bowling ball with a radius of 11 cm
starts from rest at the top of an incline 2.0 m
in height.
Find the translational speed of the bowling
ball after it has rolled to the bottom of the
incline. (Assume that the ball is a uniform
solid sphere.)The acceleration of gravity is
9.81 m/s^2.
Answer in units of m/s. Answer in units of m/s.
The translational speed of the bowling ball is 6.28 m/s.
What is translational speed?Translational speed refers to the motion of an object in a straight line. It is the speed at which an object moves from one point to another in space. In the context of a ball rolling down an incline, translational speed would refer to the speed of the ball at any given moment as it moves in a straight line down the incline.
To find the translational speed of the bowling ball after it has rolled to the bottom of the incline, we need to use the equation of motion:
[tex]v = sqrt(v0^2 + 2ax)[/tex]
where v is the final velocity, v0 is the initial velocity (0 in this case), a is the acceleration (9.81 m/s^2), and x is the distance traveled (2 m).
So,
[tex]v = sqrt(0 + 2 * 9.81 * 2)\\v = sqrt(39.24)\\v = 6.28 m/s[/tex]
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Momentum conservation often assumes that the mass of an object remains
constant throughout a process or event. However, a change in momentum can
also occur when mass changes. Consider an automobile with a full tank of
gasoline traveling at a velocity of 88.0 km/h to the east. The mass of the car when
the fuel tank is full is 1292 kg. Suppose that the car travels along a highway that
extends eastward for 600 km. By the time the car has traveled this distance, its
mass is 1255 kg. What is the car's velocity at the end of the journey?
The law of conservation of momentum states that in an isolated system, the total momentum of two or more bodies acting on each other remains constant unless an external force acts on them. Therefore, it cannot create or destroy momentum.
What is the speed of the car at the end of the trip?Velocity is the percentage of time an object moves along a path, and Velocity is the speed and direction of an object's movement.If the car is moving at a constant speed, the car is also moving at a constant speed. The confusion between the two rates, which are actually measured in the same units, is:Velocity is a vector quantity, but velocity is a scalar quantity.This is just Newton's first law. An object at rest will remain stationary and an object in motion will continue to move in the same direction at a constant speed unless an unbalanced force acts on it. The car tends to keep moving at a constant speed and direction because the two forces are canceling (i.e. balanced).To know more about speed visit:
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You weigh 730 N.
What would you weigh if the Earth were
two times as massive as it is and its radius
were two times its present value?
Answer in units of N. Answer in units of
N.
I want you to tell me the difference between a Type I and a Type II error. Define each error (you can use the book's words if you like). Tell me in your own words what a Type I error is, using an example if that would help. Do the same for a Type II error. Why are Type I and Type II errors so harmful to research? Read your answer to someone else: if they don't get it, I won't, either. Be clear.
A Type I error, also known as a false positive, occurs when a statistical hypothesis test rejects a null hypothesis that is actually true. For example, consider a medical test for a certain disease.
What is a Type II error?A Type II error, also known as a false negative, occurs when a statistical hypothesis test fails to reject a null hypothesis that is actually false. In the medical test example, a Type II error would occur if the test result suggests that the person is healthy when they actually have the disease.
Both Type I and Type II errors are harmful to research because they can lead to incorrect conclusions and decision-making.
A Type I error can result in unnecessary treatments or actions, while a Type II error can result in missed opportunities to identify and address a problem. These errors can negatively impact the validity of research and its real-world applications.
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The work function of gold is 5.1eV.
a) How many photoelectrons can you remove from a golden spoon if you leave it for 1 second inside a microwave on? (supposing that the microwave works with radiation of 15cm wavelength and that of its 600W of consumption, it manages to deposit 5% in the spoon).
b) How many can you start from the same spoon using an industrial laser with a power of 42W and 655nm wavelength for one second?
The number of photoelectrons that can be removed from a golden spoon is (30W / c) / (e x 5.1 eV). The amount to start from the same spoon is (42W) / (e x 5.1 eV).
How to calculate photoelectrons?The work function of a material is the minimum amount of energy required to remove an electron from the material.
a) To find the number of photoelectrons removed from the spoon, find the energy deposited in the spoon during 1 second. With 600W of consumption, the spoon receives 5% of this energy, which is 0.05 x 600W = 30W.
To convert this to energy per second, we need to divide by the speed of light, c: E = 30W / c. To convert this energy to electron volts, divide by the charge of an electron, e: E_ev = E / e. Finally, to find the number of electrons removed, divide this energy by the work function of gold, 5.1 eV: n = E_ev / (5.1 eV) = (30W / c) / (e x 5.1 eV),
b) To find the number of photoelectrons removed from the spoon with the industrial laser, find the energy deposited in the spoon during 1 second. With 42W of laser power, the energy deposited in the spoon during 1 second is 42W. To convert this to electron volts, divide by the charge of an electron, e: E_ev = 42W / e. Finally, to find the number of electrons removed, divide this energy by the work function of gold, 5.1 eV: n = E_ev / (5.1 eV) = (42W) / (e x 5.1 eV)
Note: This is a simplified calculation and does not take into account the efficiency of the laser and the absorption of the spoon.
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need help with # 5,6,&7 please, thanks
Answer: 5. 1/2 fraction of a wave comes by each second. 6. 1/10 of the wave comes by each second 7. 3.
Explanation: 5. The formula for frequency is f = 1/t, T being period, so the frequency is 1/2.
Same thing with the 6th question, f=1/10
The 7th question asks about celerity, the wave celerity is the speed c at which the wave moves in the x-direction, is given by c=L/T, with L being the wavelength and T being the period.
Therefore C= 6/3, C= 3.
how much energy must be absorbed by 20 point grams of water to increase its temperature from 283 degrees Celsius to 303°C 
The amount of energy required to increase the temperature of 20 g of water from 283°C to 303°C is approximately 6.1 kJ.
How much energy must be absorbed by 20 point grams of water to increase its temperature from 283 degrees Celsius to 303°C?To calculate the amount of energy absorbed by 20g of water when its temperature increases from 283°C to 303°C, you must use the formula for specific heat capacity.Specific heat capacity is the amount of energy required to raise the temperature of 1g of a substance by 1°C. The formula for specific heat capacity is Q=mcΔT, where Q is the energy absorbed, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature. In this case, the mass of the water is 20g, the change in temperature is 20°C, and the specific heat capacity of water is 4.2 J/g°C. Therefore, the energy required to increase the temperature of 20g of water from 283°C to 303°C can be calculated as follows: Q= 20g x 4.2 J/g°C x 20°C = 1680J. Therefore, the amount of energy absorbed by 20g of water to increase its temperature from 283°C to 303°C is 1680J.
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Why did Khan change 1 minute to seconds while finding the displacement of Marcia if she travels at a velocity of 5 meters per second south for 1 minute?
Answer:fdxv
Explanation:
fdc
A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 2.0 m/s, skates by with the puck. After 1.80 s, the first player makes up his mind to chase his opponent. If he accelerates uniformly at 0.32 m/s2, determine each of the following. (a) How long does it take him to catch his opponent? (Assume the player with the puck remains in motion at constant speed.) s (b) How far has he traveled in that time? mA hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 2.0 m/s, skates by with the puck. After 1.80 s, the first player makes up his mind to chase his opponent. If he accelerates uniformly at 0.32 m/s2, determine each of the following. (a) How long does it take him to catch his opponent? (Assume the player with the puck remains in motion at constant speed.) s (b) How far has he traveled in that time? m
a. Time that the first player took to catch his opponent is 14.1 s after he makes up his mind to chase his opponent.
b. The player has traveled 31.8 m to catch his opponent.
According to uniform motion remains the same and the distance will increase with time. The formula to calculate distance
d = v × t
v = uniform speed (m/s)According to non-uniform motion, the speed will increase with time when the object has acceleration. The formula to calculate distance
d = (v₁ × t) + (0.5 × a ×t²)
v₁ = initial speed (m/s)Two players didn't move at the same time. The second player moves first. After 1.80 s the first player just move.
Time traveled for the first player = tTime traveled for the second player = t + 1.80 sWhen the first player catches his opponent, the distance between the two is the same.
d first player = d second player
(v₁ × t) + (0.5 × a × t²) = v × t
(0 × t) + (0.5 × 0.32 × t²) = 2.0 × (t + 1.80)
0 + 0.16t² = 2.0t + 3.60
0.16t² - 2.0t - 3.60 = 0
multiply by 100
16.0t² - 200.0 - 360.0 = 0
divided by 8
2.0t² - 25.0t - 45.0 = 0
Using quadratic formula
a = 2.0b = - 25.0c = - 45.0t₁₂ = (- b ± (√(b² - 4ac))) ÷ 2aThe distance
d = (v₁ × t) + (0.5 × a × t²)
d = (0 × 14.1) + (0.5 × 0.32 × 14.1²)
d = 0 + (0.16 × 198.81)
d = 31.8 m
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A bullet is fired upward with a speed v0 from the edge of a cliff of height h
a. What is the speed of the bullet when it passes by the cliff on its way down?
b. What is the speed of the bullet just before it strikes the ground?
c. If the bullet is instead fired downward with the same initial speed v0, what is its speed just before it strikes the ground?
Express your answers in terms of v0, h and g. Ignore air drag. Assume the bullet is fired straight up in (a) and (b) and straight down in (c).
The speed of the bullet when it passes by the cliff on its way is V0 itself which is equal to h/t. The speed just before it strikes the grounds will be √2gh.
What is speed ?Speed is a physical quantity measuring the distance travelled per unit time. It depends on the mass of the object as well some external factors such as friction, air resistance etc.
Here, the initial velocity of the bullet = V0
the speed of the bullet within a time t to pas the height of the cliff will be h/t.
Now, the kinetic energy of the ball just before it striking the ground is equal to its potential energy.
hence, 1/2 mv² = mgh
then v = √2gh.
If the bullet is instead fired downward with the same initial speed v0, then it is accelerating downwards then the speed is √2gh + V0.
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Two cars A and B are moving at speeds of 60 km/h and 80km/h respectively .what is the speed of car A relative to car B if the two cars are moving on the same direction
Answer:
A
Explanation:
The Boring Company has proposed transporting people between Los Angeles and San Francisco, a distance of 540 km, through an underground tube from which the air has been removed to eliminate air drag. Small pods carrying four passengers would accelerate at 2.5 m/s2 until reaching a speed of 330 m/s. Later they would brake at 1.5 m/s2. A launch of one pod per minute would transport 240 passengers per hour, roughly equivalent to one jet plane per hour.
A)What would be the trip time in minutes from Los Angeles to San Francisco?
B)How far apart would two adjacent pods be on the constant-speed segment of the journey?
A launch of one pod per minute would transport 240 passengers per hour, roughly equivalent to one jet plane per hour. The total speed is 235 km/s2.
What is acceleration?acceleration, rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down.
Motion on a circle is accelerated even if the speed is constant, because the direction is continually changing. For all other kinds of motion, both effects contribute to the acceleration.
Because acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is also a vector quantity. Acceleration is defined as the change in the velocity vector in a time interval, divided by the time interval.
Therefore, A launch of one pod per minute would transport 240 passengers per hour, roughly equivalent to one jet plane per hour. The total speed is 235 km/s2.
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What would be the best conclusion from these data?
The figure shows a graph entitled Period versus Mass of a Pendulum. The horizontal x axis is labeled Mass in kilograms, and it ranges from 0 to 0.5 with intervals of 0.10. The vertical y axis is labeled Period in seconds, and it ranges from 0.20 to 1.40 with intervals of 0.20. A set of six points are plotted on the graph. The points have increasing values for mass, but have a near constant value of 1.18 for the period. Therefore, the points almost lie on a horizontal line.
Responses
The square of the period of a pendulum is related to the bob's mass.
The square of the period of a pendulum is related to the bob's mass.
The period of a pendulum is related to the length of the string.
The period of a pendulum is related to the length of the string.
The period of a pendulum is not related to the mass of the bob.
The period of a pendulum is not related to the mass of the bob.
The period of a pendulum is linearly related to the mass of the bob.
The best conclusion based on the given set of data is F. The period of a pendulum is not related to the mass of the bob
What does the data represent?
From the graph, it is clear that as the mass of the pendulum bob increases, its period remains relatively constant at about 1.18 seconds.
This suggests that the period is not related to the mass of the pendulum bob. The graph shows that the period remains nearly constant, rather than increasing or decreasing as the mass changes.
Therefore, it can be concluded that the period of a pendulum is not related to the mass of the bob.
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Light travels 186,282 miles per second.How far does it travel in an hour? IN A DAY?
A. Light travels approximately 670,616,320 miles in an hour.
B. Light travels approximately 16,094,718,080 miles in a day.
How to find out how far it travels in an hour ?Light travels at a speed of 186,282 miles per second. To find out how far it travels in an hour, we can simply multiply this speed by the number of seconds in an hour:
Distance traveled in an hour = 186,282 miles/second x 3,600 seconds/hour = 670,616,320 miles/hour
Therefore, light travels approximately 670,616,320 miles in an hour.
How to find out how far light travels in a day?To find out how far light travels in a day, we need to multiply the distance traveled in an hour by the number of hours in a day:
Distance traveled in a day = 670,616,320 miles/hour x 24 hours/day = 16,094,718,080 miles/day
Therefore, light travels approximately 16,094,718,080 miles in a day.
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draw the output voltage of point A of the given circuits
For full negative cycle and some part of positive cycle, there is be a voltage drop across the load.
What is diode?A diode is a semiconductor gadget that essentially switches current in a single direction. While significantly limiting current flow in the opposite direction, it permits easy flow in one direction.
In this given circuit, diode is placed such that the only positive half cycle of ac voltage can passes through it but an opposite potential also applied. Hence, for a certain level and upward the diode acts as short and for full negative cycle and some part of positive cycle, there is be a voltage drop across the load.
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a piece of uranium drops from 1500 Celsius to 900 Celsius. what state of matter would we expect it to be in?
At 1500°C, uranium would be in a molten or liquid state. As it cools to 900°C, it will solidify
How does the temperature affect?
The temperature of a substance determines its state of matter. At high temperatures, substances tend to be in a liquid or gaseous state, and as the temperature decreases, they solidify.
In the case of uranium, at 1500°C, it would be in a molten or liquid state because this temperature is higher than its melting point of 1132°C.
However, as it cools to 900°C, it will become solid because 900°C is below its melting point.
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The playground design committee wants the playhouse roof to be constructed from plastic. The plastic is available in thicknesses of 0.25 cm and 2 cm. You want to minimize the transfer of heat to the roof on hot Which recommendation would you make to the design and sunny days. committee?
Choose:
A. Choose the 2-cm-thick plastic because it will take longer to get warm on hot and sunny days
B. Choose the 0.25-cm-thick plastic because it will take longer to get warm on hot and sunny days
C. Choose the 2-cm-thick plastic because it will get warm more quickly on hot and sunny days
D. Choose the 0.25-cm-thick plastic because it will get warm more quickly on hot and sunny days
It should be noted that to minimize the transfer of heat to the roof, the recommendation of design would be : A. Choose the 2-cm-thick plastic because it will take longer to get warm on hot and sunny days.
What is the best recommendation?The 2-cm-thick material is advised if you want to reduce heat transfer to the roof on hot, bright days.
The reason is because they are better insulators and take longer to warm up, thicker materials offer higher thermal resistance. In this situation, the 2-cm-thick plastic would take longer to warm up on hot, sunny days, lowering the amount of heat that is transferred to the roof and assisting in keeping it cooler.
The correct option is A.
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change the speed0.200cm/s to km/yr
When we change the speed 0.200cm/s to km/yr we get 6.5 × 10⁴ km/yr.
What is Speed?
Speed refers to the rate at which something moves or operates, usually measured in units of distance per time, such as meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph). In physics, speed is defined as the magnitude of velocity, which is a vector quantity that describes the rate of change of an object's position. Speed is often used in many areas, such as transportation, sports, and technology.
We know that
1km = 1000m
1m = 100cm
and
1 year = 365day
1 day = 24 hours
1 hour - 60 min
1 min = 60 sec
With this, we have
[tex]$ \frac{200 \text{cm}}{1 \text{sec}} = \frac{200 \times 100\text{cm} \times 1000 \text{cm}}{60\ \text{sec}\times 60\ \text{sec}\times 24 \text{hours} \times 356 \text{days}}[/tex]
0.00065 km/yr
Thus, When we change the speed 0.200cm/s to km/yr we get 6.5 × 10⁴ km/yr.
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Understanding Motion from a graph An object is moving along a straight line. The graph shows the object's velocity vs. time. During which interval(s) of the graph does the speed of the object increase by equal amount in equal times? 2s to 3 s 3s to 5s 0 s to 2 s and 3 s to 5 s 0 to 2 s, and 5 to 6 s
The time that the speed of the object increase by equal amount in equal times is 0 s to 2 s .
What is uniform acceleration?Uniform acceleration is a type of acceleration in which an object moves in a straight line and the magnitude of its acceleration remains constant over time. In other words, the object's velocity increases by an equal amount in equal time intervals.
In the case of uniform acceleration, the velocity of an object changes at a constant rate, making it a key concept in kinematics and the study of motion.
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