Acupful of water and a cupful of gasoline are placed in a sunny window. both cups have the same volume of liquid in them. 24 hours later you observe that both cups have less liquid in them, but there is less gasoline than water. what can you conclude from this observation?

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

When solid surfaces slide over each other the kind of friction that occurs is called friction