The distance between two cities is 100 miles. The distance in kilometers is
1.exactly 100 kilometers.
2.less than 100 kilometers.
3.unable to be determined from given information.
4.more than 100 kilometers.
4
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Suppose that two stars are identical in every way—for example, same distance, same mass, same temperature, same chemical composition, and same speed relative to Earth—except that one star rotates faster than the other
Spectroscopically, how could you tell the stars apart? A) The faster rotating star has wider spectral lines than the slower rotating star. B) The faster rotating star will have an emission line spectrum while the slower rotating star will have an absorption line spectrum. C) The peak of thermal emission will be at a shorter wavelength for the faster rotating star than for the slower rotating star. D) There is no way to tell the stars apart spectroscopically, because their spectra will be identical.
A 10-? resistor and a 20-? resistor are connected in parallel, and this combination is connected in series to a 30-? resistor. If the arrangement is hooked to a 12-V battery, how much current flows in the circuit?
A rotary solid sorption dehumidifier is used to dehumidify air at 95ºF, 60% relative humidity. If the dehumidifier performance map is like that shown in Figure 8-24, estimate the outlet dry air temperature and its relative humidity. Then estimate the rate of water removed from 100 cfm of air.
Three masses are located as follows: a 3.5-kg mass is at the origin, a 4.2-kg mass at (0.0 m, 7.0 m), and a 6.5-kg mass at (24.0 m, 0.0 m). What is the gravitational energy of the system of masses? G = 6.67 x 10-11 N•m2/kg2
A) -2.8 × 10-10 J B) -2.0 × 10-10 J C) -1.4 × 10-10 J D) -3.2 × 10-10 J E) -3.9 × 10-10 J