The observed relativistic length of a super rocket moving by the observer at 0.70c will be what factor times that of the measured rocket length if it were at rest?
a. 0.55
b. 0.71
c. 0.51
d. 1.4
e. 1.8
b
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Where would you be if the Sun sets for six continuous months, beginning on September 23rd?
A) North Pole B) Arctic Circle C) Equator D) Antarctic Circle E) South Pole
How do high-mass stars make it more difficult for a molecular cloud to form more stars?
A) Strong winds push gas away. B) Ultraviolet photons ionize the gas. C) Ultraviolet photons heat the gas. D) Radiation pressure pushes ionized gas away. E) All of the above
A 1.9-m2 Thermopane window is constructed by using two layers of glass 4.0 mm thick, separated by an air space of 5.0 mm. If the temperature difference is 25.0 °C from the inside of the house to the outside air, what is the rate of heat flow through this window? (Thermal conductivity for glass is 0.840 J/s/m/°C and for air 0.023 4 J/s/m/°C.)
a. 2 530 W b. 426 W c. 3 190 W d. 210 W e. 2 100
When air rapidly expands, its temperature will
1) decrease, 2) increase, 3) stay the same, whereas when air is rapidly compressed, its temperature will 4) decrease. 5) increase. 6) stay the same.