During a strenuous period of extravehicular activity, an astronaut generates 2.0 MJ of heat per hour, which must be removed by means of the liquid cooling and ventilating garment (LCVG) worn under the spacesuit
How much water must be circulated in the LCVG to remove this quantity of heat if it takes it from the astronaut at 37°C and dumps it at 0°C? A) 1.5 kg/hr
B) 7.8 kg/hr
C) 13 kg/hr
D) 26 kg/hr
E) 480 kg/hr
C
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Potential: The electron-volt is a unit of
A. charge. B. electric potential. C. electric field. D. electric force. E. energy.
Pressure in a Liquid: What force does the water exert (in addition to that due to atmospheric pressure) on a submarine window of radius 44.0 cm at a depth of 9400 m in sea water? The density of sea water is 1025 kg/m3.
A.
| 5.74 × 107 N |
B. 5.74 × 1011 N
C. 2.87 × 1011 N
D. 1.83 × 107 N
E. 2.87 × 107 N
A student attaches a length of nylon fishing line to a fence post. She stretches it out and shakes the end of the rope in her hand back and forth to produce waves on the line. The most efficient way for her to increase the wavelength is to
A. increase the tension on the hose and shake the end more times per second. B. decrease the tension on the hose and shake the end more times per second. C. increase the tension on the hose and shake the end fewer times per second. D. decrease the tension on the hose and shake the end fewer times per second. E. keep the tension and frequency the same but increase the length of the hose.
Air resistance on a high-speed projectile shortens its
A) range. B) maximum height. C) both of these D) none of the above