The velocity at which the fan can shut off and the coolant can be cooled by the airflow alone is approximately 5.5 m/s.
To find the velocity at which the fan can shut off, we need to use the effectiveness-NTU method, which relates the effectiveness of the heat exchanger to the number of transfer units (NTU) and the heat capacity ratio (C). The first step is to calculate the heat capacity rate (Crate) of the radiator, which is the product of the mass flow rate (m) and the specific heat capacity (c) of the coolant. In this case, Crate = 4 kg/s x 4180 J/kg.K = 16,720 W/K.
Next, we can use the following equation to find the effectiveness of the heat exchanger:
ε = (1 - exp(-NTU(1 - C)))/(1 - C x exp(-NTU(1 - C)))Using a first guess of Cr = 0.3, we can calculate the value of NTU as follows:
NTU = Crate/(h x A)where h is the heat transfer coefficient and A is the heat transfer area.
Since we are given the surface area of the intake (0.25 m²), we can estimate the heat transfer area as 0.5 x surface area (assuming both sides of the radiator are used for heat transfer). Assuming a heat transfer coefficient of 10 W/m².K, we get:
NTU = 16,720/(10 x 0.5 x 0.25) = 13,376Substituting these values into the effectiveness equation, we get:
ε = (1 - exp(-13,376(1 - 0.3)))/(1 - 0.3 x exp(-13,376(1 - 0.3))) = 0.984The effectiveness represents the fraction of the maximum possible heat transfer that can be achieved, given the heat exchanger design and operating conditions. We can use it to calculate the outlet temperature of the coolant (Tco) as follows:
ε = (Thi - Tco)/(Thi - Tci)Tco = Thi - ε(Thi - Tci) = 200 - 0.984(200 - 25) = 28.4 °CSince we want the coolant to be cooled by 15 °C, the inlet temperature (Thi) should be 43.4 °C. We can now use the following equation to find the velocity (V) of the air required to achieve this temperature drop:
Q = Crate x (Thi - Tco) = ρ x V x A x c x (Thi - Tci)where Q is the heat transferred, ρ is the density of air, and c is the specific heat capacity of air.
Assuming a density of 1.2 kg/m³ and a specific heat capacity of 1005 J/kg.K, we get:
V = Q/(ρ x A x c x (Thi - Tci)) = 560/(1.2 x 0.25 x 1005 x 15) = 5.52 m/sTherefore, the velocity at which the fan can shut off and the coolant can be cooled by the airflow alone is approximately 5.5 m/s.
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in an electric generator a turning loop of wire placed between two permanent magnets causes electromagnetic induction in the wire. which sentence best explains the effect of the turning loop of wire in an electric generator.
The magnetic field between the magnets causes the charged particles within the wire to move.
Option D is correct
What is a magnetic field?A magnetic field is described as a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.
Faraday's law of electromagnetic induction sates that whenever their is a relative motion of a conductor is magnetic field, an emf will be induced in the conductor and the strength of the induced emf is directly proportional to the rate of change of magnetic flux linking the circuit.
Therefore, motion of the electrons is due to magnetic field created by the permanent magnet of the electric generator.
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Complete question:
In an electric generator a turning loop of wire placed between two permanent magnets causes electromagnetic induction in the wire. which sentence best explains the effect of the turning loop of wire in an electric generator.
A. The magnets cause charged particles within the wire to move as the poles of the magnets switch.
B. The moving electrons flow from the permanent magnets into the loop of wire.
C. The magnetic field of each magnet attracts the metal in the moving loop of wire.
D. The magnetic field between the magnets causes the charged particles within the wire to move.
a light bulb is 40% efficient. if it is supplied with 1000 joules of electrical energy, how many joules of light does it emit
The amount of energy emitted by the light bulb is 600J.
How to calculate efficiency?Efficiency is the extent to which a resource is used for the intended purpose; the ratio of useful work to energy expended.
According to this question, a light bulb is 40% efficient. If it is supplied with 1000 joules of electrical energy, the amount of energy emitted can be calculated as follows:
40% of 1000J = 400J of energy used.
This means that 1000J - 400J = 600J of energy will be emitted.
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A car accelerates uniformly from rest and
reaches a speed of 17.9 m/s in 9.6 s. The
diameter of a tire is 38 cm.
Find the number of revolutions the tire
makes during this motion, assuming no slip-
ping.
Answer in units of rev.
Answer:
Below
Explanation:
Find distance vehicle travels during this acceleration
d = vo t + 1/2 a t^2
a = change in velocity / change in time = 17.9/9.6 = 1.86458 m/s^2
vo = 0 ( it starts from rest )
then d = 1/2 ( 1.86458)* 9.6^2 = 85.92 meters
Now divide by the tire circumference to get the number of revs
85.92 m / ( .38 m * pi )/rev = ~ 71.97 revs
Answer: 64.5 rev. ✅
Explanation: The diameter of the tire is 38cm and the car accelerates uniformly from rest to reach a speed of 17.9m/s in 9.6s. The distance covered by the tire can be calculated by using the formula: distance = speed x time.
The distance covered by the tire is 17.9 x 9.6 = 171.84 meters. But when we convert it centimeters it is 17184 cm
The distance covered by the tire is equal to the circumference of the tire, which is equal to 2πd (d is the diameter of the tire). So we can calculate the number of revolutions by dividing the distance covered by the tire by the circumference of the tire.
Number of revolutions = distance covered / Circumference of the tire = 17184/ (2 x π x (38/100)) = 64.5 ✅
Starts at rest at 3m to the right after 10s he is traveling 2m/a to the left where does he end up
He ends up 17 meters to the left of the center position, according to the given question.
In physics, what is position?An object's location at any given time is known as its position (x), and its change in position is known as displacement. Both of these must be determined from the reference frame because they are vector values.
Suppose he is at a position which is 3 m. right from the center position
Given data :
Initial position = 3m to the right
Time = 10 sec.
Speed = 2m/s.
By using the formula -
speed = distance / time
distance = speed × time
distance = 2 × 10
distance = 20 m.
He end up at 17 m. to the left from the center position.
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In both cases shown at right, an astronaut is a distance x from a moon. The two cases are identical except that in Case A there is a large planet directly between the astronaut and the moon.
a) Is the gravitational force on the astronaut by the moon greater in Case
A, greater in Case B, or the same in both cases? Explain your reasoning.
b) In which case will the astronaut have greater acceleration? Explain your reasoning.
The only exception is Mars, which is noticeably less brilliant at opposition compared to how apparent the other planets are on Earth.
Can astronauts see Earth?Numerous astronauts and cosmonauts have observed the Overview Effect, saying that when they view the Earth from space, it appears to be "a tiny, fragile ball of life dangling in the emptiness, sheltered and nourished by a paper-thin atmosphere."The first citizen of India to visit space is Rakesh Sharma. India's space mission made it the 14th country in the world to launch a man into space.Moons and planets within the solar system. … Jupiter, Saturn, Uranus, and Neptune, together known as the Jovian planets or big planets, are massive bodies with densities less than 2 grammes per cubic centimetre. Jupiter and Saturn are predominantly made of hydrogen and helium, while the other three are made of ice, rock, hydrogen, and helium (Uranus and Neptune).To learn more about planets refer to:
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The percentage of body weight that is made up of fat when compared to your other tissue, bone and muscles.
The percentage of body weight that is made up of fat when compared to your other tissue, bone and muscles is called body composition.
Body composition refers to the proportion of fat, muscle, bone, and other types of tissue in the body. It is often expressed as a percentage of body weight that is made up of fat. Body composition can be measured using various methods such as skinfold thickness measurements, bioelectrical impedance, and dual-energy x-ray absorptiometry (DXA).
A healthy body composition is generally considered to be one with a low percentage of body fat and a high percentage of muscle mass. It is important to note that body composition is not the same as body weight, as two individuals can weigh the same but have very different body compositions. An imbalance in body composition can lead to health issues such as obesity and increased risk of chronic diseases. Regular exercise and a healthy diet can help to maintain a healthy body composition.
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Please show your complete solution of these questions.
(THOSE WHO ANSWERED WITH COMPLETE STEPS WILL BE MARKED AS BRAINLIST)
Answer:
11520
Explanation:
6.4×1800 wich is kw × 30 minutes in seconds
The air in the balloon had a mass of 0.00320 kg
The temperature of the air in the balloon decreased by 215 °C
The change in thermal energy of the air in the balloon was 860 J
Calculate the specific heat capacity of the air in the balloon.
The specific heat capacity of the air in the balloon is 125.88 J/kg °C.
What is specific heat?Specific heat is the amount of energy required to raise the temperature of a unit mass of a substance by one degree. It is measured in joules per kilogram Kelvin (J/kgK). Specific heat is an important physical property of a substance, as it determines how much energy is required to change its temperature. It is also used to calculate the amount of energy released or absorbed during a chemical reaction. Specific heat is also known as heat capacity, and is often used to compare the heat capacity of different materials.
The specific heat capacity of a substance is the amount of energy required to raise the temperature of 1 kg of the substance by 1 °C.
To calculate the specific heat capacity of the air in the balloon, we can use the equation:
Q = m * c * ΔT
Where Q is the change in thermal energy, m is the mass of the air, c is the specific heat capacity, and ΔT is the change in temperature.
Rearranging the equation, we get:
c = Q / (m * ΔT)
Plugging in the values given, we get:
c = 860 J / (0.00320 kg * 215 °C)
c = 860 J / (0.0068 kg °C)
c = 125.88 J/kg °C
Therefore, the specific heat capacity of the air in the balloon is 125.88 J/kg °C.
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help me pls i will be happy if yall help me
Electrons do not follow specific paths, so describing the area where an electron is likely to be is more scientifically accurate and is actually an improvement over earlier models.
The first option is correct.
What is an electron?The electron is described as a subatomic particle with a negative one elementary electric charge.
Modern orbital theory predicts electron in specific orbitals which are three-dimensional in nature.
It is a quantum mechanical phenomenon where we can not apply classical mechanics to determine the exact position of electron.
The square of the amplitude wave function associated with the electron gives the probability of finding the electron in a particular region.
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What does MLA 9 in-text citation look like?
MLA 9 in-text citation looks like: (Burke 3); (Best and Marcus 9); (Franck et al. 327).
In MLA 9th edition, in-text citations will be:
If there is only 1 author or no author; we only need the author's last name and the page number. As an example: (Burke 3).If there are 2 authors; we need to connect both authors' last names with and, and include the page number. As an example: (Best and Marcus 9).If there are 3 or More Authors; we have to use the first author's last name and et al., and include the page number. As an example: (Franck et al. 327)Learn more about MLA citation at: https://brainly.com/question/29548082
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Discribe the phrase "like dissolves like" in terms of polarity.
The phrase "like dissolves like" can be described as the compounds which have similar nature dissolve in each other that is polar dissolves polar and non-polar dissolves non-polar molecules.
What is Polarity?Polarity is the separation of electric charge which is leading to a molecule or the chemical groups which are having an electric dipole moment, with a negatively charged end and a positively charged end as well. Polar molecules are the molecules which must contain one or more polar bonds which occur due to a difference in the electronegativities between the bonded atoms of the molecule.
A simple way to predict the compounds which will dissolve in other compounds is the phrase of the compound such as "like dissolves like". This means that the polar compounds dissolve in polar compounds, and the nonpolar compounds dissolve in nonpolar compounds, however, the polar and nonpolar molecules do not dissolve in each other.
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1. What is the difference between instantaneous speed and average speed?
2.What is the equation used for calculating average speed when an object is uniformly accelerating?
Which of the following ions will have a charge of negative 1?
The sodium electric charge ion on the right has a total charge of -1 and consists of 17 protons and 18 electrons.
Ion: What Does It Mean?Ions are any atoms or clusters of atoms with an electric charge. Cations are the name for positive-charged ions. Anion is the name for ions that have a negative charge. Several common compounds are present in the body as ions. Examples of typical salts are sodium, potassium, calcium, chloride, and bicarbonate.
What are the uses of ion?Beyond scientific instruments, these charged particles have significant applications in home appliances like smoke detectors and air purifiers. By disrupting and neutralizing the airborne bacteria, ions can clean the air.
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Find the angular acceleration of a spinning amusement-park ride that initially travels at 0.50 rad/s then accelerates
to 0.60 rad/s during a 0.50 s time interval.
The angular acceleration of a spinning amusement park ride is 0.2 rad/s^2.
What does circular motion's angular acceleration mean?The pace at which an object moving in a circle changes angular velocity over time is referred to as angular acceleration. Rotational acceleration is another name for angular acceleration. It has both magnitude and direction, making it a vector quantity.
What are angular acceleration and angular velocity?The rate of change in angular displacement is known as angular velocity, and the rate of change in angular velocity is known as angular acceleration.
What is the name for zero acceleration?Zero magnitude acceleration is still acceleration. Motion with uniform (i.e. zero) acceleration is a specific case of motion with constant velocity.
Given:
Initial acceleration = 0.50 rad/s
Final acceleration = 0.60 rad/s
Time = 0.50 s
Angular Acceleration:
α = Δω/Δt
[tex]\alpha = \frac{0.60-0.50}{0.50}[/tex]
[tex]\alpha =\frac{0.1}{0.50}[/tex]
[tex]\alpha =0.2rad/s^2[/tex]
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Bill bye the science guy motion worksheet
IM SO CONFUSED
A billiards player hits the 0.17 kg cue ball so that it travels towards the stationary 0.16 kg 8-ball with a speed of 0.48 m/s. If the cue ball stops after the collision, what is the resulting speed of the 8-ball? What is the change in momentum of the cue ball? What is the change in momentum of the 8-ball?
In accordance with the conservation of momentum law the 8-ball's final speed after a collision is 0.51 m/s.
The momentum, what is it?momentum is the result of a particle's mass and velocity. Being a vector quantity, momentum possesses both direction and magnitude.
Given data :
Mass of cue ball(m1) = 0.17 kg
Mass of 8-ball(m2) = 0.16 kg
Initial speed of cue ball (u1) = 0.48 m/s
Initial speed of 8-ball (u2) = 0 m/s
Final speed of cue ball (v1) = 0 m/s
Final speed of 8-ball (v2) = v2 m/s
The total momentum before and after a collision is equal, according to the conservation law of momentum.
Hence,
m1u1 + m2u2 = m1v1 + m2v2
0.17 × 0.48 + 0.16 × 0 = 0.17 × 0 + 0.16 × v2
0.0816 + 0 = 0 + 0.16v2
0.0816 / 0.16 = v2
0.51 m/s = v2
v2 = 0.51 m/s
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A metal phere with a ma of 8. 00 kg ocillate at the end of a vertical pring with a pring contant of 2. 40 ✕ 104 N/m. The motion i damped by air reitance, and the damping coefficient i b = 3. 00 N · /m
The frequency of the damped oscillation is 24.6 Hz
The equation for frequency of the damped oscillation is as follows:
f = (1 / (2 × π)) × √((k - (b² / 4 × m)) / m)
where "π" is a mathematical constant approximately equal to 3.1415, "k" is the spring constant, "m" is the mass of the sphere, and "b" is the damping coefficient.
f = (1 / (2 × π)) × √((2.4×10⁴ N/m - (3.00 Ns/m² / 4 × 8.00 kg)) / 8.00 kg)
f = (1 / (2 × π)) × √((2.4×10⁴ N/m - (3.00 Ns/m² / 4 × 8.00 kg)) / 8.00 kg)
f = (1 / (2 × π)) × √((2.4×10⁴ N/m - (3.00 Ns/m² / 4 × 8.00 kg)) / 8.00 kg)
f = (1 / (2 × π)) × √(24000 - (3/32)) N/kg
f = (1 / (2 × π)) × √(23997) N/kg
f = (1 / (2 × π)) × 153.26 N/kg
f = 24.6 Hz
Therefore, the frequency of the damped oscillation is 24.6 Hz
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Your question seems to be missing, but I suppose the question was:
"A metal sphere with a mass of 8. 00 kg oscillate at the end of a vertical spring with a spring constant of 2. 40 ✕ 10^4 N/m. The motion is damped by air resistance, and the damping coefficient is b = 3. 00 Ns/m. Calculate the frequency of the damped oscillation."
Help Needed
What is the M.A. (Mechanical Advantage) of a screwdriver with a radius from the center to the outermost edge of the tip of 50.0 mm, and the radius of the handle of 240 mm? Remember that there are 1000.0 mm in 1.0000 m, and while solving the problem show your work of course.
The mechanical advantage of the screwdriver is 0.208.
How to calculate mechanical advantage?Mechanical advantage is the ratio of the output force produced by a machine (especially a simple machine) to the applied input force.
The efficiency of a simple machine is determined by calculating their mechanical advantage (MA). Mechanical advantage is a measure of the force amplification attained by the machine.
According to this question, the screwdriver has a radius from the center to the outermost edge of the tip of 50.0 mm, and the radius of the handle of 240 mm. The mechanical advantage can be calculated as follows:
M.A = 50/240
M.A = 0.208
Therefore, 0.208 is the mechanical advantage of the simple machine.
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Which phrases describe the formation of the Hawaiian Islands? Check all that apply.
formed due to subduction
formed in the middle of a plate
formed at a divergent boundary
formed at a convergent boundary.
formed where mantle erupts through crust
Formed due to subduction, formed at a convergent boundary, and formed where mantle erupts through crust.
What is subduction?Subduction is the geologic process in which one tectonic plate moves beneath another and is forced downwards into the mantle. It is an important part of plate tectonics, as it is responsible for the formation of mountain ranges and volcanism. Subduction occurs at convergent boundaries, where two plates come together, and is usually accompanied by earthquakes, as the plates grind and slide against each other. Subduction zones are the areas where this process is occurring, and they are typically found in the world's oceans, along the margins of the continental plates.
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Question on spring oscillator.
a) The force constant is 2.49 N/m
b) The amplitude is 1.65 m
What is the force constant?We know that a spring can be said to be the kind of substance that has a potential energy that has been stored in it and this energy is released to do work when the spring has been pulled.
We have that;
T = 2π√m/K
T = period
m = mass
K = spring constant
Then;
0.84 = 2*3.14√0.447/K
0.84/2*3.14 = √0.447/K
(0.84/2*3.14)^2 = 0.447/K
K = 0.447/0.0179
K = 2.49 N/m
Then the amplitude is obtained from;
W = 1/2 KA^2
A =√2W/K
A = √2 * 3.4/2.49
A = 1.65 m
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20m/s at 275 degrees from the x-axis
So, the magnitude of velocity concerning:
x-axis approximately 1.74 m/s to the x-positive, andy-axis approximately -19.92 m/s (19.92 m/s to the y-negative).Introduction and Formula UsedHi! Here I will help you to solve problems related to the velocity vector. In this problem, we know that a particle moves at a certain speed with an angle ([tex] \sf{\theta} [/tex]) on the x-axis. Of course, with conditions like this, velocity can be described on the x or y-axis. The result of the x-axis velocity is horizontal movement. On the other hand, the y-axis velocity is vertical movement. See the equation below to know the magnitude of velocity concerning the x and y-axis.
Velocity respect to the x-axis[tex] \boxed{\sf{\bold{v_x = v_i \cdot \cos(\theta)}}} [/tex]
Velocity respect to the y-axis[tex] \boxed{\sf{\bold{v_y = v_i \cdot \sin(\theta)}}} [/tex]
With the following condition:
[tex] \sf{v_i}[/tex] = the initial velocity[tex] \sf{\theta}[/tex] = elevation angle[tex] \sf{v_x}[/tex] = the velocity respect to the x-axis[tex] \sf{v_y}[/tex] = the velocity respect to the y-axisProblem SolvingWe know that:[tex] \sf{v_i}[/tex] = the initial velocity = 20 m/s[tex] \sf{\theta}[/tex] = elevation angle = 225°What was asked?[tex] \sf{v_x}[/tex] = the velocity respect to the x-axis = ... m/s.[tex] \sf{v_y}[/tex] = the velocity respect to the y-axis = ... m/s.Step by step:Find the magnitude of velocity respect to the x-axis[tex] \sf{v_x = v_i \cdot \cos(\theta)} [/tex]
[tex] \sf{v_x = 20 \cdot \cos(275^{\circ})} [/tex]
[tex] \sf{\bold{v_x \approx 1.74 \: m/s}} [/tex]
Find the magnitude of velocity respect to the y-axis[tex] \sf{v_y = v_i \cdot \sin(\theta)} [/tex]
[tex] \sf{v_y = 20 \cdot \sin(275^{\circ})} [/tex]
[tex] \sf{\bold{v_y \approx -19.92 \: m/s}} [/tex]
ConclusionSo, the magnitude of velocity concerning:
x-axis approximately 1.74 m/s to the x-positive, andy-axis approximately -19.92 m/s (19.92 m/s to the y-negative)The sum of the potential energy and the kinetic energy of an object is its thermal energy.
The sum of the potential energy and the kinetic energy of an object is called as mechanical energy.
An object's mechanical energy can be defined as the result of its motion (i.e., kinetic energy) and/or the result of its stored position energy (i.e., potential energy).
Kinetic energy is defined as the energy gained by a body when it is in motion.Kinetic energy is obtained due to the motion of the object and potential energy is obtained due to the height and elastic potential of the object.Potential energy is defined as the energy gained by a body based on its position, arrangement and state of the object. Potential energy can be further divided into two parts: gravitational potential energy and elastic potential energy.In principle, the total amount of mechanical energy is only referred to as the sum of potential energy and kinetic energy.To know more about mechanical energy,
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A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stop watch measures the stone's trajectory time from the top of the cliff to the bottom to be 4. 3 s. What is the height of the cliff?.
By using kinematic equation, the height of the cliff would be 90.6 meters.
The kinematics equations are frequently used to analyze the free-falling motion of an object, in this case we are given that:
The time (t) = 4.3 seconds
Acceleration due to gravity (a) = 9.8 meters per second
Since we know that the time it takes for the stone to fall to the ground is 4.3 s, we can use the following formula to determine the height to which the stone will fall as a result of gravity:
x = v₀t + 1/2 at²
where x is the displacement, v is the velocity, t is the time, and a is the acceleration.
x = 0 + 1/2 (-9.8) (4.3)²
x = -90.6
As the result, the height of the cliff would be 90.6 meters.
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SCIENCE MADLIB
Using the graph provided, interpret the data and create your own story of what could have been happening. Make sure to tell whether you are accelerating, stopped, or decelerating at each point. For example, we were accelerating from our starting point A to the next point B.
please hurry
The story that describes the graph is, we were accelerating from our starting point A to the next point B, then from point B started decelerating to our next point C, rested between point C and D, and finally we started our journey again by accelerating to point E.
What is displacement time graph?
A displacement time graph, is a type of graph that is used to describe the motion of an object with respect of how the object is changing its position with time.
The change in position with change in the time of motion of the object gives velocity of the object which is also equal to the slope of the graph.
v = Δx / Δt
where;
Δx is the change in position of the objectΔt is the change in time of motionFrom the given graph we can conclude the following based on the motion;
from point A to B there is accelerationfrom point B to C there is decelerationfrom point C to D there is no acceleration because velocity is zerofrom point D to E there is accelerationLearn more about displacement - time graph here: https://brainly.com/question/19144777
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A Physical Education (gym) class is playing a game of soccer. During the game, the ball experiences a net force of 0 newtons. Which statement explains what is most likely happening with the ball?
When the ball experiences a net force of 0 newtons, its state of motion remains unchanged, that is, it will remain in rest or will move with same speed in same direction.
What is force?The definition of force in physics is: The push or pull on a massed object changes its velocity. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.
As the ball experiences a net force of 0 newtons, it experiences balanced force and its state of motion remains unchanged.
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The rate at which a certain balloon travels is inversely proportional to the amount of weight attached to it if the balloon travels at 10 in./s and then there is a 2nd g weight attached to it approximately how much weight must be attached to the balloon for it to travel 18 in./s
The rate at which a certain balloon travels is inversely proportional to the amount of weight attached to it if the balloon travels at 10 in./s and then there is a 2nd g weight attached to it approximately the weight must be attached to the balloon for it to travel 18 in./s is 1.1 grams.
When 2 grams are added, the rate moves at 10 in/sec.
Since the weight and the distance traveled are inversely proportional, the expression can be written as
d= k/W
10 =k/2
k= 20
When 2 grams are attached, the rate moves at a speed of 10 in/second.
Given that the relationship between the weight and the traveled distance is inverse, this can be expressed as,
d= k/W
18= k/w
w= k/18
Substitute value of k in the above expression.
W= 20/18
W=1.11 gram
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An object with a weigh of 170 N on Earth i brought to planet Oobla. Where it ha a weight of 360 N. What i the gravitational field trength on Oobla
The gravitational field strength on Oobla is 20.8 N/kg. It is greater than the gravitational field strength on Earth.
What is the gravitational field strength?The gravitational field strength, also called acceleration due to gravity or free-fall acceleration, is the gravitational force that acts on a mass of object. It can be expressed as
g = F/m
Where
g = gravitational field strength (N/kg or m/s²)F = gravitational force or weight (N)m = mass of object (kg)The gravitational force can be stated as weight of object W. The formula becomes W = mg. So, the weight of an object depends on the gravitational field strength on a place.
An object has a weight of 170 N on Earth. The weight becomes 360 N on Oobla. Find the gravitational field strength on Oobla!
We know that the gravitational field strength on Earth is 9.8 N/kg.
Let's say:
W₁ = weight on Earthg₁ = gravitational field strength on EarthW₂ = weight on Ooblag₂ = gravitational field strength on OoblaThe mass of an object is always the same wherever it is.
So, the gravitational field strength on Oobla is
m = W/g
m₁ = m₂
W₁/g₁ = W₂/g₂
170/9.8 = 360/g₂
g₂ = (9.8×360)/170
g₂ = 20.8 N/kg
It is greater than the the value of g on Earth.
Hence, the planet Oobla has the gravitational field strength of 20.8 N/kg.
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A concave mirror has a focal length of 18 cm. This mirror forms an image located 54 cm in front of the mirror. What is the magnification of the mirror? (Include the sign.)
magnification m = -v/u = -2
Concave mirrors can generate both real and virtual images. A virtual, magnified image of the object is produced when the concave mirror is positioned very near to it.
As the distance between the object and the mirror increases, the size of the image decreases and real images are produced. When an object's distance is less than the focal length in a concave mirror, the magnification will be higher than one. When the object's distance exceeds the focal length, the magnification is less than one.
Given focal length f = 18 cm
image distance v = 54 cm
then from lens equation
(1/f) = (1/u)+(1/v)
(1/18) = (1/u)+(1/54)
-(1/u) = (1/54)-(1/18)
object distance u = (18*54)/(18-54) = 27 cm
magnification m = -v/u = (-54)/(27) = -2
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Quartz and halite have different crystal shapes primarily because
answer choices
Light reflects from crystal surfaces
Energy is released during crystallization
Of impurities that produce surface variations
The internal arrangement of atom
Quartz and halite have different crystal shapes primarily because of the internal arrangement of atom.
Due to some reasons, quartz and halite have different crystal shapes. Primarily, the reasons are:
Both are formed from molten material.Both are composed of minerals.Both are produced by heat and pressure.The very distinct key characteristics that make us can easily observe and differ between quartz and halite is that quartz crystals always make a pointed pencil shape. It has 6 sides on terminal ends as resembling a prism. Furthermore, halite tastes like salt, because halite is salt. The other characteristics that we could use to differentiate between two of them is that a quartz crystal is hexagonal in cross section, meanwhile a halite crystal is square in cross section.
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A rocket blasts away from the earth with a cargo for the international space station. Sketch the graph of the force of gravity the rocket experiences from the earth as a function of time.