Chapter 7 & 8 AP Physics Set
1)A pendulum consists o f a ball of mass m suspended600at the end of a massless cord of length L as shown above.The pendulum is drawn aside through an angle of 600withLthe vertical and released. At the low point of its swing, the speed of the pendulum ball is
a) (gL)1/2b) (2gL)1/2c) 1/2 gLd) gLe) 2gL
2)A rock is lifted for a certain time by a force F that is greater in magnitude than the rock's weight W. The change in kinetic energy of the rock during this time is equal to the
3)During a certain time interval, a constant force delivers an average power of 4 watts to an object. If theobject has an average speed of 2 meters per second and the force acts in the direction of motion of theobject, the magnitude of the force isa) 16 Nb) 8 Nc) 6 N d) 4 Ne) 2 N4)A weight lifter lifts a mass m at constant speed to a height h in time t. How much work is done by theWeight lifter?
5) When a certain rubber band is stretched a distance x, it exerts a restoring force of magnitude F = ax + bx2. The work done by an outside agent in changing the stretch from x = 0to x = Lis
6)A spring which does not obey Hooke's Law supplies a force of magnitude x2, where x is measured downward from the equilibrium position of the unloaded spring and is a constant. A mass m is attached to the end of the spring and is released from rest at x = 0. What is its maximum downward displacement?
a) (mg/)1/2b) (3mg/)1/2c) mg/d) 2mg/e) 3mg/
7)Suppose the force required to tow a canal barge is directly proportional to the speed. If it takes 4 horse-power to tow the barge at a speed of 2 mi/hr, what horsepower is required to move the barge at a speedof 6 mi/hr?
8)A particle is acted upon by a net force F = F0e-kx. If the particle has a velocity equal to zero at x = 0, then the maximum kinetic energy that the particle can attain is
9)If a particle moves in such a way that its position x is described as a function of time t by x = t
its kinetic energy is proportional to