A hydraulic press, like an inclined plane, is capable of increasing energy
A) sometimes true
B) always false
C) always true
D) sometimes false
Answer: B
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When ultraviolet light is incident upon glass, most atoms in the glass
A) resonate. B) pass the light energy along practically undiminished. C) freely absorb and reemit most of the ultraviolet light.
A scuba diver has his lungs filled to half capacity (3 liters) when 10 m below the surface. If the diver holds his breath while quietly rising to the surface, what will the volume of the lungs be (in liters) at the surface? Assume the temperature is the same at all depths. (The density of water is 1.0 × 10^3 kg/m3.)
a. 5.9 b. 4.5 c. 6.4 d. 3.9 e. 3.1
Imagine that you could magically move the moon closer to Earth, so that the distance from Earth to moon is cut in half. This would cause the force that Earth exerts on the moon to be
A) reduced to 1/4 of its original value. B) doubled. C) increased to four times its original value. D) halved. E) Nonsense--Earth exerts no force on the moon.
A very loud train whistle has an acoustic power output of 80 W. If the sound energy spreads out spherically, what is the intensity level in dB at a distance of 100 meters from the train? (I0 = 10-12 W/m2)
a. 78.3 dB c. 92.8 dB b. 88.0 dB d. 95.0 dB