A 60.0-kg man jumps 1.70 m down onto a concrete walkway. His downward motion stops in 0.025 seconds. If he forgets to bend his knees, what force is transmitted to his leg bones?
a. 13 900 N
b. 346 N
c. 8 000 N
d. 1 790 N
a
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A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of
A) less than 1 unit. B) more than 1 unit. C) 1 unit. D) not enough information
Kinetic Energy: How much kinetic energy does a 0.30-kg stone have if it is thrown at 44 m/s?
A. 290 J B. 580 J C. 440 J D. 510 J
You observe an object to be moving in a straight line at a constant speed. What can you conclude? (Assume the object does not have any engines or other power source.)
A) The net force acting on the object is zero. B) No forces of any kind are acting on the object. C) The only force acting on the object is gravity. D) The only force acting on the object is air resistance. E) Some unseen force must be keeping the object in motion.
Suppose an equation relating position, x, to time, t, is given by x = bt3 + ct4, where b and c are constants. The dimensions of b and c are respectively:
a. T3, T4. b. 1/T3, 1/T4. c. L/T3, L/T4. d. L2/T3, L2/T4.