Which person’s watch or clocks register(s) a coordinate time between those events in some inertial frame?
A. Alice
B. Bob
C. Carol
D. Alice and Bob
E. Bob and Carol
F. Alice and Carol
T. All three observers
E. Bob and Carol
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A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into the room per cycle. What is the coefficient of performance?
A. 4 J B. 20 J C. 24 J D. 44 J
Work-Energy Theorem: A 100-N force has a horizontal component of 80 N and a vertical component of 60 N. The force is applied to a cart on a level frictionless floor. The cart starts from rest and moves 2.0 m horizontally along the floor due to this force. What is the cart's final kinetic energy?
A. 200 J B. 160 J C. 120 J D. zero
When you ride your scooter you have momentum. When you ride twice as fast you have
A) almost twice the momentum. B) twice the momentum. C) four times the momentum. D) none of the above
A 35-mm camera equipped with a 45-mm focal length lens is used to photograph a tree 15 m tall. If the aperture of the lens is set at f/2, what is the aperture diameter?
A) 14 mm B) 18 mm C) 32 mm D) 23 mm E) 27 mm