A car travels along the perimeter of a vertical circle (radius = 0.25 km) at a constant speed of 30 m/s. What is the magnitude of the resultant force on the 60-kg driver of the car at the lowest point on this circular path?
a. 0.37 kN
b. 0.80 kN
c. 0.22 kN
d. 0.59 kN
e. 0.45 kN
c
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A 0.61 m radius hemisphere (811 K surface temperature) is filled with a gas mixture containing 6.67 % CO2 and water vapor at 0.5 % relative humidity at 533 K and 2-atm pressure. Determine the emissivity and absorptivity of the gas, and the net rate of radiant heat flow to the gas.
GIVEN
A hemisphere filled with a gas mixture
Hemisphere radius (r) = 0.61 m
Hemisphere surface temperature (T1) = 811 K
Gas temperature (Tm) = 533 K
Gas pressure (pT) = 2 atm
Gas mixture: 6.67% of CO2 and water vapor at R.H. = 0.5%
FIND
(a) The emissivity (?m) and absorptivity (?m) of the gas
(b) The net rate of radiant heat flow to the gas (q1–m)
ASSUMPTIONS
The hemisphere surface is black (?1 = 1)
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant
the saturation pressure of water at 533
You drive 6.00 km at 50.0 km/h and then another 6.00 km at 90.0 km/h. Your average speed over the 12.0 km drive will be
A) greater than 70.0 km/h. B) equal to 70.0 km/h. C) less than 70.0 km/h. D) exactly 38.0 km/h. E) cannot be determined from the information given, must also know directions traveled
Since 1 kilowatt equals 1000 watts, and 1 hour equals 3600 seconds, it follows that the kilowatt-hour is
A) an energy of 3.6 million joules. B) a power of 3.6 million watts. C) an energy of 3.6 million watts. D) a power of 3.6 million joules. E) None of the above.
A totally eclipsed Moon glows coppery red because
a. the Moon's surface is made of iron ore which is red in color. b. red light is cooler than blue light. c. during a lunar eclipse the Sun is cooler than normal and its light is more red. d. only red light is able to pass completely through Earth's atmosphere and reach the Moon. e. the Moon appears red during a total solar eclipse, not a total lunar eclipse.