Aroof tile falls from rest from the top of a building. an observer inside the building notices that it takes 0.28 s for the tile to pass her window, which has a height of 1.0 m. how far above the top of this window is the roof?

The specific heat of silver is 0.057 calories/gram°c. if 10.0 grams of silver were heated and the temperature of the sample changed by 20.0°c, how many calories of heat energy were absorbed by the sample?

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?

Which of the following are molecules? a. al b. ag c. mgcl2 d. nacl e. c3h8