a black sphere with a diameter of 25 cm is suspended in air what is the surface temperature necessary to heat 10 kg of air what is the wavelength at the peak intensity

Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.