A 3.8 kg object is lifted 12 meters. Approximately how much work is performed during the lifting? A. 588 J B. 45.6 J C. 446.9 J D. 372.4 J

Answers

Answer 1

Answer: To approximately measure the work performed during the lifting, you can use the following formula :
W = m.g.h , where m = mass, g = gravity, h = height

3.8 x 9.8 x 12 = 446.9 Joule , approximately

Answer 2

Answer:

I just took the test and c. 446.9 J is correct

Related Questions

When a physical change occurs, the mass of the substance is conserved. This means that the total mass of the substance remains the same from beginning to end. The physical properties of the substance, such as size and shape, may change, but the amount of matter in the substance does not change.
The output of a solar panel powers a small pump. The pump operates a garden water fountain. The output of the solar panel is 10 V and the current supplied to the pump is 0.25 A. Calculate the electrical power generated by the solar panel.
In scientific terms, how is power related to work? A.Power is the ability to do work. B.Power is the force of work over a certain distance. C.Power is the rate at which work is accomplished. D.Power is the energy supplied in a force.
The force between two magnetic poles will increase as their separation is increased. true or false?
Which term refers to the time interval between the passage of successive wave crests? a. wave height b. wave period c. wave speed d. wavelength

Linus builds an electrical circuit with a battery and with wires that carry the current. As the battery weakens, the current also weakens. How does this affect the magnetic field around the wires? A. The field gets stronger.

B. The field gets weaker.

C. The field changes direction.

D. The field disappears completely.

Answers

Answer: The correct answer is option (B).

Explanation:

The current carrying wire produces the magnetic field around it. More the current in the wire, stronger will be the magnetic strength around the wire. The magnetic field is stronger near this wire.

The direction of the magnetic field depends on the direction of the current.

In the given problem, Linus builds an electrical circuit with a battery and with wires that carry the current.The strength of the magnetic field depends on the amount of current flowing in the wire. As the battery weakens, the current also weakens.

Therefore, the magnetic field around the wires is weaker.

The magnetic field getting weaker is the correct answer when Linus builds an electrical circuit with a battery and with wires that carry the current. The correct answer is (B).

The strength of the magnetic field around the wires is directly proportional to the current flowing through the wires. As the battery weakens and the current decreases, the magnetic field strength around the wires also decreases.

Conversely, if the current increases, the magnetic field strength increases. This relationship is described by Ampere's law and the right-hand rule, which state that the magnetic field is directly proportional to the current.

Therefore, The correct answer is (B). The magnetic field getting weaker is the correct answer.

To know more about the magnetic field:

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Have researchers have now been able to cool substances to absolute zero

Answers

It's a law of nature, which I don't understand too well, that we can
cool things as close to Absolute Zero as we want to, but we can
never get all the way there.

I think that individual atoms and molecules have been cooled in
the laboratory to within a few thousandths of a Celsius degree
of it ... actually not too shabby an accomplishment !
____________________________________

WOW ! I just went and searched online for more information
on this subject. (You can't imagine what great stuff you can find
by doing that. You ought to try it some time.)

The 1997 Nobel Prize in Physics was awarded to a team of three
physicists who invented a method of using lasers to slow down the
motion of atoms, and that's the same thing as cooling them. They
were able to cool some atoms to a temperature of 240 millionths
of a degree above Absolute Zero !

Discuss gravitational force and strong nuclear force. Describe at least two ways that they are alike and two ways that they are different.

Answers

Gravitational force is the slight attraction of bodies caused by their masses.

Strong nuclear force is the colossal force possessing protons together in an atomic nucleus.
Alike:

They are both attractive forces.
They are both charge-independent

Different:

Vigorous nuclear force only applies to protons while gravity applies to all matter.
Gravity occurs on all levels of space while the robust nuclear force only occurs at the sub-atomic level.

If you put a pot on the stove, the pot becomes hot. The heat is transferred to the pot on the burner by radiation. Please select the best answer from the choices provideda. True
b. False

Answers

The answer is False. The example of heat transfer in this problem is not by radiation, but by conduction. This is because the pot is put directly on the surface of the stove, which is what conduction is - direct contact between two surfaces at different temperatures. Radiation, on the other hand, involves heat transfer by electromagnetic waves such as heat from the sun to the Earth.

If you put a pot on the stove, the pot becomes hot. The heat is transferred to the pot on the burner by radiation. the answer is false

What is the acceleration of a ball traveling horizontally with an initial velocity of 20 meters/second and, 2.0 seconds later, a velocity of 30 meters/second?

Answers

The acceleration of the ball is 5 m/s^2. This can be calculated using a formula that relates the change in velocity, acceleration, and time. This formula is:

Vf = Vi + at

where:
Vf = final velocity
Vi = initial velocity
a = acceleration
t = time

Substituting the values gives:

30 = 20 + a(2)
a = 5 m/s^2 --> Final Answer

Answer:

5.0 meters/second^2

I hope this helps!!

Explanation:

A chunk of aluminum at 91.4°C was added to 200.0 g of water at 15.5°C. The specific heat of aluminum is 0.897 J/g°C, and the specific heat of water is 4.18 J/g°C. When the temperature stabilized, the temperature of the mixture was 18.9°C. Assuming no heat was lost to the surroundings, what was the mass of aluminum added?

Answers

Final answer:

The mass of the aluminum added is calculated through the principle of conservation of energy, specifically thermal energy. By considering the heat lost by the aluminum and gained by the water, we can rearrange the equation for heat transfer and find that the mass of the aluminum is approximately 37.9 grams.

Explanation:

In this physics question, we're looking at a thermodynamic process involving a chunk of aluminum and water. Given the known values of their respective specific heats, the mass of water, and their final equilibrium temperature, we're aiming to find the mass of the aluminum.

We begin by understanding that in a closed system, the heat gained by one body is equal to the heat lost by another. In this case, the aluminum is losing heat, and the water is gaining it. The equation for heat transfer (Q = mcΔT), where m is mass, c is specific heat, and ΔT is change in temperature.

The heat gained by the water = mass of water * specific heat of water * change of temperature in water = 200g * 4.18J/g°C * (18.9°C - 15.5°C) = 2836.4J.

This is equal to the heat lost by the aluminum. Solving the analogous heat equation for the mass of the aluminum gives us the answer:

m = Q / (c * ΔT) = 2836.4J / (0.897J/g°C * (91.4°C - 18.9°C)) = 37.9g

So the mass of the aluminum is approximately 37.9 grams.

Learn more about Thermodynamics here:

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Most of the Earth's volcanoes occurA. near the center of tectonic plates.B. where there are no tectonic plates.C. along tectonic plate boundaries.D. before tectonic plates can form.

Scientists have observed that the average sunspots have increased in the last 50 years. Which of these statements best describes an effect of this increase in sunspots? A) Earth's temperature has become cooler. B) Earth's temperature has not changed over time. C) Earth's temperature has become warmer. D) Earth's temperature has reduced by fifty times.

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A ray at which angle would produce the most glare? A. 25 degrees B. 59 degrees C. 37 degrees D. 70 degrees