Which statement best describes the energy changes that occur while a child is riding on a sled down a steep, snow-covered hill?

a)
kinetic energy decreases and potential energy increases.

b)
kinetic energy increases and potential energy decreases.

c)
both potential and kinetic energy decrease.

d)
both potential and kinetic energy increase

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy

Air conditioners not only cool air, but dry it as well. suppose that a room in a home measures 5.0m×9.0m×2.4m . if the outdoor temperature is 30 ∘c and the vapor pressure of water in the air is 85 % of the vapor pressure of water at this temperature, what mass of water must be removed from the air each time the volume of air in the room is cycled through the air conditioner? the vapor pressure for water at 30 ∘c is 31.8 torr.