Answer:
b
Explanation:
If someone showed you two spheres of the same size but with different masses, say 1g and 10kg, and asked which would hit the ground first after being dropped from the Leaning Tower of Pisa, what would you say? If you’re like most people, you would say the 10kg sphere would hit the ground first. Aristotle said so too, and for 1,000 years everyone believed him. But doing the experiment would show you, besides a great view of Pisa, that in fact, both spheres hit the ground at the same time.This is exactly what Galileo did, showing the world that objects of different masses fall at the same rate. (This is also a good example of why it is important to do experiments yourself and not to just take someone else’s word for it.) To start understanding why Galileo was right, we need to understand the difference between several physics words that are often jumbled together and confused: mass, weight, speed, velocity, acceleration, and force.
Which of the following does not represent a contact force?
Answer:
B dropping a marble from the roof
Explanation:
You aren't putting force on it
Dropping a marble from a roof does not represent a contact force.
What is contact force?A contact force is a force that an object can only apply to another object by physically touching it.
An illustration of contact forces is: (1) Muscular force(2) Force of friction.
In this question, Pushing an object on the floor and kicking a soccer ball across the field is example of muscular force, which is a contact force. Even a weight of a pen on a table applied force via contact. But during dropping a marble from a roof, gravitational force comes into play which is a field force - not a contact force.
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heat conduction can not take place between two objects if..
a) the total thermal energy of the two objects is the same
b) the objects are in contact
c) the temperatures of the two object are different
d) the two objects are in thermal equilibrium
Answer:
the two objects are in thermal equilibrium
Explanation:
thermal equilibrium us the state where two bodies or objects have the same amount of temperature thus no heat conduction
A man takes a brick out of the fire when it's at 285 degree Celsius,he drops it in a bucket of water.then covers the bucket.the bucket and cover are made of an insulating material.the bucket contains 2.6 kg of ice originally at -5 degree celsius.the 1.3 kg brick is made of iron .which has a specific heat of 448J/kg degree celsius.lets find out the temperature of brick and water once equilibrium is reached.specific heats of ice , liquid water,steam are 2090,4186,1970 respectively
Answer: The equilibrium temperature of brick and water is 2.82 Kelvin
Explanation:
Initial Temperature Ø of the brick = 285 degree Celsius
Initial temperature of ice = - 5 degree Celsius
Mass of iron = 1.3kg
Specific heat capacity c of iron = 448J/kg
In thermal experiments,
Heat lost = heat gain.
Let's first calculate the heat lost
The brick will loose heat.
H =mcØ
Heat lost = 1.3 × 448 × (285 - T)
Heat lost = 582.4( 285 - T )
Now let's calculate for heat gain
Heat gain = mcØ + mcØ + mcØ
Heat gain = [(2.6×2090) + (2.6×4186) + (2.6×1970)](T - -5)
Heat gain = 5434 + 10883.6 + 5122(T+5)
Heat gain = 21439.6( T + 5)
Equating the heat lost and the heat gain leads to
582.4( 285 - T) = 21439.6(T+5)
Open both bracket
165984 - 582.4T = 21439.6T + 107198
Collect the like terms
21439.6T - 582.4T = 165984 - 107198
20857.2T = 58786
T = 58786/20857.2
T = 2.82 Kelvins
The equilibrium temperature of brick and water is 2.82 Kelvin
Both objects A and D represent fixed, negatively-charged particles of equal magnitude and Object B represents a fixed, positively-charged particle (equal, but opposite charge from A and D). Object C shows a moving, positively-charged particle. Identify which arrow would correctly show the force of attraction or repulsion on object C caused by the other two objects?
A) 1
B) 2
C) 3
D) 4
Answer:
Option A = 1.
Explanation:
So, in order to solve this question we are given the Important infomation or data or parameters in the question above as;
(1). First, Both objects A and D represent fixed.
(2). Both objects A and D are negatively-charged particles of equal magnitude.
(3). "Object B represents a fixed, positively-charged particle (equal, but opposite charge from A and D)."
(4). "Object C shows a moving, positively-charged particle."
So, our mission is to determine the arrow that would correctly show the force of attraction or repulsion on object C caused by the other two objects.
We can do that by drawing out the forces of attraction and the resultants. Therefore, CHECK THE ATTACHED FILE/PICTURE FOR THE DRAWINGS.
The forces of attraction due to objects A and B on on object C will be towards themselves. Hence, the resultant is ONE(1).
Answer:
Its actually 3
Explanation: USATESTPREP
Which part of the telescope gathers light from a faraway object and reflects it to another mirror?
A.
secondary mirror
B.
primary mirror
C.
magnifying lens
D.
eyepiece
Answer:
2)primary mirror
Explanation:
A reflecting telescope contains mirrors and a refracting telescope contains lenses. There are two mirrors in basic reflecting telescope. The primary mirror gathers the light from the bodies at distance and reflects it towards the secondary mirror. The secondary mirror is placed at such an angle that it then reflects the light towards the eye piece and we can observe the faraway body.
Answer:
B. Primary mirror
Explanation:
States of matter question
Answer:
Solid and liquid
Explanation:
In solid state, the particles are tightly packed together hence forming a regular shape.
In liquid state, the particles are tightly packed together with some degree of movement.
In gaseous state, the particles are loosely packed and free to move randomly.
Since the particles of both solid and liquid state are tightly packed together, their corresponding density will only show a slight difference and hence almost similar.
I a liter jar contains 0.5 moles of gas at a pressure of 2 ATM what is the temperature of the gas
Answer:
The temperature of the gas is 48.75 Kelvin.Explanation:
Using the ideal gas equation as shown
PV = nRT where;
P is the pressure of the gas in ATM
V is the volume of the gas
n is the number of moles
R is the ideal gas constant
T is the temperature in Kelvin
From the formula, [tex]T = \frac{PV}{nR}[/tex]
Given the following parameters V = 1litre, n = 0.5moles. pressure = 2ATM
R = 0.08206 atm L/molK
On substituting to get the temperature we have:
[tex]T = \frac{2*1}{0.08206*0.5} \\T = \frac{2}{0.04103}\\T = 48.75Kelvin[/tex]
Convection is usually described as a ___________; when something is heated, it rises, cools, and then falls in a circular pattern.
Answer:
Current
Explanation:
Convection is the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat. Simply put, Convection is the circular motion that happens when warmer air or liquid — which has faster moving molecules, making it less dense — rises, while the cooler air or liquid drops down.
An everyday example of convection is boiling water ; The heat passes from the burner into the pot, heating the water at the bottom. The water at the bottom rises and is replaced by the water at the top of the pot.
This rise of less dense water at a higher temperature and fall of denser water at a lower temperature sets up a convention current circularly until the water boils. This is a typical example of the day to day application of convection currents.
The cuboid and the cube below are placed on the floor. The cuboid has a weight of 60N and the cube has a weight of 40N. Which exerts a greater pressure on the ground? Prove your answer.
Hello. You forgot to put the image that shows information needed to answer that question. The image is attached below:
Answer:
The cuboid and the cube exert the same pressure on the floor.
Explanation:
To answer this question, we must first consider that the area of the cuboid is equal to 24cm^2, while the area of the cube is equal to 16cm^2.
With that, we must calculate the pressure that each exerts, with the formula:
P = F / A
Cuboid: P = 60 / 0.0024 = 25000 N/m^2
Cube: P = 40 / 0.0016 = 25000 N/m^2
Answer:
Check Explanation
Explanation:
Pressure applied on a surface is defined as the force applied divided by the perpendicular cross sectional Area to the applied force
Pressure exerted by the cuboid = (weight of the cuboid)/(surface Area of the base of the cuboid touching the ground)
Weight of the cuboid = 60 N
surface Area of the base of the cuboid touching the ground = A(cuboid)
P(cuboid) = [60/A(cuboid)]
Pressure exerted by the cube = (weight of the cube)/(surface Area of the base of the cube touching the ground)
Weight of the cube = 40 N
surface Area of the base of the cube touching the ground = A(cube)
P(cube) = [40 ÷ A(cube)]
So, the diagram for the two structures, a cube and a cuboid is still missing from the internet, without this diagram and the surface area of their bases, we cannot truly tell which structure is undergoing which pressure. So, what I've done will make it very much simpler if all the diagrams are beyond.
P(cuboid) = [60/A(cuboid)]
P(cube) = [40/A(cube)]
Plugging in the surface areas, esp when their surface areas would be known wicked.
That way, the pressure appears so, you will go!!!
Hope this Helps!!!
When the Net Force quadrupled from 50N to 200N, how many times bigger was the acceleration?
Answer:
acc. also gets increased four times
Where does the charge of a circuit go when it reaches a capacitor?
Answer:
Explanation:
When the charge of a circuit reaches the capacitor, all charge is distributed in the surface of the capacitor in order to create an electric field. The opposite of this charge is also in the capacitor, but separated.
When the capacitor receive more charges, its stability changes. Thus, the charge in one of the plates of the capacitor demands that charge on the other plate move out of the capacitor to equilibrate the charge. Thus, the current in the circuit is not interrupted.
Answer:
It gets stored somewhere in the capacitor
Explanation:
I got it right
Which energy sources input can cause the turbine (wooden wheel)tobspin and generate electrical energy?
Answer:
The energy source which can cause the turbine (wooden wheel) to spin and generate electrical energy is hydro-energy source.
Explanation:
The energy source which can cause the turbine (wooden wheel) to spin and generate electrical energy is hydro-energy source. Hydro energy source, is the energy source gotten from the force of falling water.
Hydro energy causes the turbine to spin converting it mechanical energy and finally to electrical energy using a generator.
Force of falling water (hydro-energy source) ------>spinning of turbine (mechanical energy) ---------------> electrical energy
Question 15
Experiments performed with light indicate that light exhibits
particle properties, only
wave properties, only
both particle and wave properties
o neither particle nor wave properties
Question 16
Answer:
Both particle and wave properties
Explanation:
Light is defined as a particle and a wave, and even as a combination of a particle and a wave. A unit of light is the photon. Higher energy photons behave like particles and low energy photons behave like waves.
Experiments performed with light indicate that light exhibits both particle and wave properties.
Which two states border Washington, DC? Maryland, West Virginia Delaware, Virginia Delaware, West Virginia Maryland, Virginia
Answer:
I believe it would be Pennsylvania and New Jersey they both border Maryland. Didn't see any other states that border Maryland with West Virginia and Virginia being exempt from the question.
Explanation:
Answer: the correct answer is Maryland and Virginia
Explanation:
Will the current increase or decrease if you increase voltage?
Answer:
It will increase
Explanation:
All other things being equal, an increase in voltage will produce a corresponding increase in current, or flow of electrons. Voltage and current are related in a positive way, as one increases the other increases and vice versa.
What does an electromagnet do?
a dolphin emits a sonar chirp, and hears an echo from a fish 0.325 s later. if the speed of sound in the ocean is 1520 m/s, how far is the fish from the dolphin? (unit=m/s)
Answer:
distance = 1/2 (0.325) × 1520
= 247m
The fish will be approximately 494 meters away from the dolphin.
To determine the distance between the dolphin and the fish, we can use the formula:
Distance = Speed × Time
In this scenario, the speed we need to consider is the speed of sound in the ocean, which is given as 1520 m/s. The time delay between the emission of the sonar chirp and the reception of the echo is 0.325 seconds.
By substituting these values into the formula, we can calculate the distance:
Distance = 1520 m/s × 0.325 s
Multiplying the speed of sound by the time delay gives us:
Distance = 494 m
Therefore, the fish is approximately 494 meters away from the dolphin.
The reason we can use the formula Distance = Speed × Time in this scenario is because the speed of sound is constant in the given medium (ocean), and the time delay represents the round-trip time for the sound wave to travel from the dolphin to the fish and back.
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How do nuclear reactions illustrate conservation of energy and matter?
Answer:
In a nuclear reaction, the total (relativistic) energy is conserved. The "missing" rest mass must therefore reappear as kinetic energy released in the reaction; its source is the nuclear binding energy. Using Einstein's mass-energy equivalence formula E = mc², the amount of energy released can be determined.
5. What is the amplitude of the waves shown in the diagram below?
Answer:
0.54 m
Explanation:
Example below.
Electromagnetic waves require a medium to transfer energy
True or False
The statemengt is false. Electromgnetic waves do not require a medium to transfer energy. They can transfer energy through vacuum (empty space with nothing in it). If electrimagnetic waves needed a medium to move through from place to place, then we could never see the sun, and also it would get very cold here.
when two strands of dna line up adenine pairs up with
Which statement about electromagnetic waves is true?
A.
Electromagnetic waves require a medium to travel.
B.
Electromagnetic waves don't require a medium to travel.
C.
The particles of the medium through which electromagnetic waves travel vibrate perpendicularly to the direction of the wave.
D.
The particles of the medium through which electromagnetic waves travel vibrate parallel to the direction of the wave.
Answer:
b
Explanation:
Answer:
they transfer energy
Explanation:
Colby’s dog was running in the park with a speed of 28 m/s. If is dog had 6000 J of kinetic energy, find his dog’s mass.
Answer:
The dog's mass is 15.3kg.
Explanation:
Given that the formula for kinetic energy is k.e = 1/2×m×v² where m represents mass and v is the velocity. Then, you have to substitute the following values into the formula :
[tex]k.e = \frac{1}{2} \times m \times {v}^{2} [/tex]
Let k.e = 6000,
Let v = 28,
[tex]6000 = \frac{1}{2} \times m \times {28}^{2} [/tex]
[tex]6000 \div 784 = \frac{1}{2} \times m[/tex]
[tex] \frac{1}{2} \times m = \frac{375}{49} [/tex]
[tex]m = \frac{375}{49} \div \frac{1}{2} [/tex]
[tex]m = \frac{375}{49} \times 2[/tex]
[tex] m = \frac{750}{49} [/tex]
[tex]m = 15.3kg \: (3s.f)[/tex]
The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 200 Joules of heat(Q) is added to 10 grams?
Answer:
7.8 J/g °C
Explanation:
0.39 J/g °C x 200 J / 10g
= 7.8 J/g °C
Answer:
above is the answer to your question.
which shows the formula for converting from degrees Celsius to degrees Fahrenheit?
F=95*°C) +32
F=59* (°C-32)
F='C-273
Answer:
°F = (9/5 x °C) + 32
Explanation:
Using the upper and lower fixed point as shown in the attached photo, we can obtain the formula for converting from degrees Celsius to degrees Fahrenheit. This is illustrated below:
°C – 0/100 – 0 = °F – 32/212 –32
°C/100 = °F – 32 /180
Cross multiply
100(°F – 32) = 180 x °C
Divide both side by 100
°F – 32 = 180 x °C /100
°F – 32 = 9/5 x °C
Make °F the subject
°F = 9/5 x °C + 32
°F = (9/5 x °C) + 32.
Answer:
the first choice
Explanation:
got it right on the test. hope this helps! :)
briefly explain the factors that affect the center of gravity.
Answer:
:)
Explanation:
The strength of the gravitational force between two objects depends on two factors, mass and distance. the force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled. increases, the force of gravity decreases.
Explanation:
gravity is the force that gives weight to objects and causes them to fall on the ground when dropped. 2 major factors MASS and DISTANCE affects the strength of gravitational force on an object
A particle is moving with a constant speed of 25 m/s in 90 m radius circle what is the angular speed in radian per second about the center of a circle
Answer:
the angular speed in radian per second about the center of a circle is 0.278 rad/s
Explanation:
Given;
Linear velocity v = 25m/s
Radius of circular path r = 90m
The linear velocity of the particle can be expressed as a function of the angular speed as;
Linear velocity = angular speed × radius of path
v = wr
w = v/r
Where;
v = linear velocity
r = radius
w = angular speed
Substituting the given values, we have;
w = 25/90 = 0.278 rad/s
the angular speed in radian per second about the center of a circle is 0.278 rad/s
Which chemical in tobacco smoke may damage cilia in the respiratory
system?
tar
nitrogen
carbon monoxide
nicotine
Answer:
nicotine
Explanation:
what are power tools
Answer:
Tools that require electricty like drills
Explanation:
Answer: Power tools are those tools that are use with electricity...
Explanation:
The wave formula is shown below. Check all boxes that are correct.
1) Wave speed is inversely related to the product of wavelength and frequency.
2) Wavelength has an inverse relationship with wave frequency when wave speed remains constant.
3) Wave speed is directly related to the product of wavelength and frequency.
4) Frequency has a direct relationship to wavelength when speed remains constant.
5) Wavelength and frequency are not related to wave speed.
Answer:
3) Wave speed is directly related to the product of wavelength and frequency.
4) Frequency has a direct relationship to wavelength when speed remains constant
Explanation:
V is the velocity (wave speed)
f is the frequency
the symbol next to the frequency is the wavelength
Velocity is proportional because the wavelength and frequency are multiplying.
It would be inversely proportional when the velocity is the dividend of the wavelength and frequency.
On the second statement, frequency (and wavelength) are directly related/proportional to the speed of the wave.