What would happen if a person who is wearing a heavy winter jacket were to place a thermometer inside the jacket next to his or her skin? What would happen if we took the same jacket, after it had been hanging in a closet, and placed a thermometer inside?

Answers

Answer 1

Answer:

Answer:

Explained.

Explanation:

Let me explain the two cases in by one.

(1) When Person wearing a jacket, heat from his or her body is going to get trapped inside his or her jacket to keep this person warm when a thermometer is placed inside, it would indicate a higher temperature on the scale.

(2) When Jacket is Hanging in a closet, its temperature would be roughly close to room temperature and when we would place a thermometer it would not indicate any change on its scale.

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A motor with a power of 7.0 × 104 watts lifts a loaded elevator to a height of 20.00 meters for 40 seconds. What is the force exerted by the motor on the elevator?

Answers

Answer:

$1.4\cdot 10^5 N$

Explanation:

First of all, we can find the work done as follows:

$W=Pt$

where P is the power and t is the time taken. In this problem, $P=7.0\cdot 10^4 W$ and $t=40 s$ , so the work done is

$W=Pt=(7.0\cdot 10^4 W)(40 s)=2.8\cdot 10^6 J$

The work done is equal to the force applied F times the displacement d:

$W=Fd$

since we know d=20.0 meters, we can re-arrange the equation to find the force exerted:

$F=(W)/(d)=(2.8\cdot 10^6 J)/(20.0 m)=1.4\cdot 10^5 N$

Answer:

C) 1.4 × 105 newtons

Explanation:

Correct answer on plato/edmentum

Which state of matter has the greatest amount of kinetic energy?

Answers

Answer:

A pure substance in the gaseous state contains more energy than in the liquid state, which in turn contains more energy than in the solid state. Particles has the highest kinetic energy when they are in the gaseous state.

Explanation:

Sana makatulong.

Which of the following cannot be determined from the spectrum of a star?the chemicals in the atmosphere of the star
the motion of the star
the temperature of the atmosphere of the star
the chemicals in the core of the star

Answers

Answer:

The chemicals in the core of the star

Explanation:

The spectrum of a star is of its atmosphere. The absorption or emission spectrum that is obtained indicates the chemical composition of the star's atmosphere. The peak wavelength obtained indicates the surface temperature of the star (using Wien's-Displacement Law). The shift in the spectrum indicates the motion of the star. If there is blueshift, it indicates that it is moving towards us where as if there is a red shift, it indicates that it is moving away from us.

The event that cannot be determined from the spectrum of a star is that the chemicals in the atmosphere of the star

A bowling ball with a mass of 4.5 kg travels at a velocity of 37 m/s for 2.5 s until it stopped at the end of the lane by the ball return. What additional info is required to determine the weight of the bowling ball?

Answers

None. We already have more than we need ... provided only that the lane is on Earth.

Weight = (mass) (gravity).

On Earth, 'gravity' = 9.8 m/s^2.

Weight of the ball =

(4.5 kg) (9.8 m/s^2).= 44.1 newtons.

(roughly 9.9 pounds)

A truck accelerates 2 m/s2 when it is empty. If the truck is filled so that it has twice the mass and the same amount of net force is applied, how much will the truck accelerate?8 m/s2
1 m/s2
4 m/s2
2 m/s2