Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy 100 Mpc away would have a recession velocity of ____
a. 0.7 km/s
b. 1.43 km/s
c. 30 km/s
d. 170 km/s
e. 7,000 km/s
e
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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
The lunar mare are found
A) uniformly all over the Moon. B) only in the dark areas of the lunar poles, where water is not boiled away. C) mainly on the near side. D) mainly on the far side. E) only as layered rocks, since the original water was lost long ago.
A vertical wire carries a current straight up in a region where the magnetic field vector points toward the north. What is the direction of the magnetic force on this wire?
A) downward B) toward the north C) toward the east D) toward the west E) upward F) toward the south
Which of these lamps employs semi-conductor technology?
A) incandescent lamp B) fluorescent lamp C) CFL D) LED