A submarine dives to a depth of 50 meters in the ocean. (a) What is the gauge pressure at this depth? (b) What is the force acting on a hatch that has an area of 2.5 square meters?
(a) 490,000 Pa, (b) 1,225,000 N
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John is nearsighted and cannot see things beyond 90 cm from his eyes. What is the refractive power of the contact lenses that will enable him to see distant objects clearly?
A) +1.1 diopters B) -1.1 diopters C) -1.7 diopters D) -2.2 diopters E) +2.2 diopters
(Do not try the following: it could kill you. This question is only about a hypothetical possibility.) If you were standing below an object emitting a fixed frequency sound falling at terminal velocity, as it approached you, you would hear the sound
a. drop in frequency. b. stay at the same frequency. c. increase in frequency. d. decrease in loudness. e. stay at the same loudness.
As a kid playing on the playground, you would bend your knees when you landed after jumping off the monkey bars to reduce the "sting" in your feet. This worked because
A. bending your knees gave you upward momentum which partly canceled the downward momentum. B. bending your knees lowered your center of gravity reducing the force of your fall. C. bending your knees increased the time of contact for the ground to bring you to rest. D. you didn't do it on purpose, your knees just buckle
Which of the following is about as cheap as coal for base-load electric power today?
A) photovoltaic cells B) solar-thermal generation of electricity C) wind turbines D) All of the above. E) None of the above.