Why does a sheet of sandpaper become warm when you rub it against a wooden board?
a. heat in the air is transferred to the sandpaper
b. matter in the sandpaper is converted to heat
c. the chemical energy in the wood is converted to thermal energy
d. the mechanical energy of the moving sandpaper is converted to thermal energy
im inn between c or d but im stuck! !

An experiment is designed to test the relationship between the initial height of a basketball before it is dropped to the height of its rebound bounce. the height of the rebound bounce is measured using a scale positioned behind the ball. in the above experiment, which condition would not be controlled? a). the starting height of the ballb). the surface the ball bounces on c). the type of ball d). the method to measure the rebound height of the ball

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.

The researcher who studied the ability of cats to learn to escape from puzzle boxes was