A16.7 kg block is dragged over a rough, horizontal surface by a constant force of 132 n acting
at an angle of 25.8. above the horizontal. the block is displaced 57,8 m, and the coefficient of
kinetic friction is 0.229. find the magnitude of the work done by the force of friction. answer in
units of j.

Which best represents the law of conservation of mass ?

A2-kg bowling ball is 2.5 meters off the ground on a post when it falls. just before it reaches the ground, it is traveling 7 m/s. assuming that there is no air resistance, which statement is true?

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.