Does potential energy increase,kinetic energy decrease when a book is placed on a shelf

ale4655 [162]

Answer:

A.It’s not moving.

Explanation:

Position-Time graphs display the motion of a object by showing the changes of velocity with respect to time.

The motion of a car on a position-time graph that is represented with a horizontal line indicates that the car has stopped moving.

A straight line with a positive slope indicates that the car is moving at a constant velocity, and thus the slope is constant. On the other hand, a curve with a changing slope, shows that the velocity is changing.

3 0

3 years ago

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The density of helium gas at 0.0 ◦C is 0.16 kg/m3 kg/m3. The temperature is then raised to 100.6 ◦C, but the pressure is kept co

Svetach [21]

Answer:

0.11694 kg/m³

Explanation:

T₁ = 0.0 °C = 273.15 K

ρ₁ = Density = 0.16 kg/m³

T₂ = 100.6 °C = 373.72 °C

PV = mRT

Realtion with density

$Pm=\rho RT\\\Rightarrow \rho =\frac{Pm}{RT}\\\Rightarrow \rho T= \frac{Pm}{R}$

P, m and R are constants, so

$\rho_1 T_1=\rho_2 T_2\\\Rightarrow \rho_2=\frac{\rho_1 T_1}{T_2}\\\Rightarrow \rho_2=\frac{0.16\times 273.15}{373.72}\\\Rightarrow \rho_2=0.11694\ kg/m^3$

∴ New density of the gas is 0.11694 kg/m³

6 0

4 years ago

This graph shows the acceleration of a racehorse taking off from the starting gate. By how much did the horse’s speed increase b

dimaraw [331]

Explanation:

This graph shows the acceleration of a racehorse taking off from the starting gate. By 27m/sin horse’s speed increase between 4 seconds and 6 seconds?

5 0

3 years ago

Balanced forces act on a ball that is being held above the ground in someone's hand. explain why these forces on the ball are ba

Licemer1 [7]

Hi Andrescruz9386

The ball in someone's hand is a balanced force because the object is staying in motion and is not changing at all so its evenly balanced, if its swinging back and fourth it is in motion and it wont stop till it becomes unbalanced, if the ball is just being held above the ground yes its balanced because nothing Is happening to it, its basically like a balance scale, if both sides are even and equal, than nothing will happen because there is no side that has more or less its equal so that's why its balanced, in order for it to be unbalanced it has to be brought upon unbalanced forces.

3 0

3 years ago

Waves are observed passing under a dock. Wave crests are 8.0 meters apart. The time for a complete wave to pass by is 4.0 second

Debora [2.8K]

<h3>Answer;</h3>

The period of the wave is 4 seconds

<h3>Explanation;</h3>

The period of a wave or periodic time is the time taken for one complete oscillation to occur. In this case, one complete oscillation occurs when the wave moves from one crest to the next or a trough to the next. This takes 4 seconds. Therefore the period is 4 seconds.
Frequency on the other hand is the number of oscillations by a wave in one second. Thus, f = 1/T, that is frequency is the reciprocal of periodic time.

4 0

3 years ago

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