Consider a bus designed to obtain its motive power from a large rotating flywheel (1400. kg of diameter 1.5 m) that is periodically brought up to its maximum speed of 3600. rpm by an electric motor at the terminal
If the bus requires an average power of 12. kilowatts, how long will it operate between recharges?
39. minutes
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Doubling the aperture diameter of a camera lens will change the f-number by what factor?
a. 1/4 b. 1/2 c. 2 d. 4 e. 1/3
What is the most accurate way to determine the distance to a distant galaxy (a galaxy that is too far away for us to see individual stars)?
A) radar ranging B) parallax C) using Cepheid variables D) using white dwarf supernovae
A 550- N person empties her lungs as much as possible and is then completely immersed in water of density 1000 kg/m3 while suspended from a harness connected to a spring scale. The spring scale reads now 21.2 N. What is her density?
A) 1050 kg/m3 B) 1040 kg/m3 C) 1030 kg/m3 D) 960 kg/m3 E) 56.1 kg/m3
Consider diving 30.0 m below the surface of the ocean (density 1.03 grams/cc)
(a) what is the gauge pressure at that depth, in atmospheres? (b) what is the absolute pressure at that depth, in atmospheres? (c) If you were in a submarine at that depth, what would be the total force on a 100. cm2 window?