A large stone is resting on the bottom of the swimming pool. The normal force of the bottom of the pool on the stone is equal to the:
a. weight of the stone.
b. weight of the water displaced. c. sum of the weight of the stone and the weight of the displaced water.
d. difference between the weight of the stone and the weight of the displaced water.
D
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The graph shows the force on an object as it moves a distance x. What is the work done by the force when the object moves from 2.0 m to 8.0 m?
A. 35 J
B. 48 J
C. 50 J
D. 52 J
E. 60 J
A 25.0-mH inductor is connected in series to a 20.0-? resistor through a 15.0-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the time constant of this circuit?
A) 0.800 × 10-3 s B) 0.800 × 10-2 s C) 0.500 s D) 1.25 × 10-3 s E) 12.5 × 10-2 s
Mt. Everest is more than 8000 m high. How fast would an object be moving if it could free fall to sea level after being released from an 8000 m elevation? (Ignore air resistance.)
a. 396 m/s c. 1200 m/s b. 120 m/s d. 12,000 m/s
When light reflects and produces a clear image, this reflection is referred to as:
a. retroreflection. c. diffuse reflection. b. specular reflection. d. double reflection.