If the distance a spring is stretched from its equilibrium position is halved the potential energy of the spring is multiplied by
A. 4
B. 2
C. 0.5
D. 0.25
D. 0.25
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Thin Lenses: How far from a +50-mm focal length lens, such as is used in many 35-mm cameras, must an object be placed so it will form a real image that is 3.0 times the size of the object?
A. 46 mm B. 52 mm C. 58 mm D. 67 mm
What is the phase of the Moon shown in the above image?
a. third quarter
b. first quarter
c. waxing gibbous
d. waning gibbous
Suppose you climb the stairs of an eight-story building, about 24 m high, and your mass is 70 kg. The gravitational potential energy you gain is about
A. 40 calories. B. 16,500 calories. C. 40 Joule. D. 16,500 Joule.
A uniform ladder 15 ft long is leaning against a frictionless wall at an angle of 53° above the horizontal. The weight of the ladder is 30 pounds. A 75-lb boy climbs 6.0-ft up the ladder. What is the magnitude of the friction force exerted on the ladder by the floor?
a. 43 lb b. 34 lb c. 38 lb d. 47 lb e. 24 lb