A 0.140-kg baseball is dropped and reaches a speed of 1.20 m/s just before it hits the ground. It rebounds with a speed of 1.00 m/s. What is the change of the ball's momentum?
A)
0.0280 kg?m/s upwards
B)
0.0280 kg?m/s downwards
C)
0.308 kg?m/s upwards
D)
0.308 kg?m/s downwards
E)
0 kg?m/s
C
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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
The planets never travel in a straight line as they orbit the Sun. According to Newton's second law of motion, this must mean that
A) the planets are always accelerating. B) the planets have angular momentum. C) the planets will eventually fall into the Sun. D) a force is acting on the planets.
A piece of wood 350 mm × 350 mm and 15 mm thick conducts heat through its thickness under steady state conditions. The rate of heat flow is measured to be 14.0 watts when the temperature difference is 28 C°
Determine the coefficient of thermal conductivity for this wood A) 9.2 × 10-4 J/(m?s?C°) B) 270 J/(m?s?C°) C) 16 J/(m?s?C°) D) 0.061 J/(m?s?C°) E) 33 J/(m?s?C°)
Does the change in speed of light when it enters a material substance indicate that light is more like a wave or more like a particle of the kind considered by Newton?
a. More like a wave. b. More like a particle. c. It varies from material to material. d. Similar to both. e. Not at all like either one.