The Sun has been on the main sequence
a. for about 10 million years.
b. for about 5 billion years.
c. forever.
d. for about 14 billion years.
b
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The most striking and largest valley in the solar system is
A) the Grand Canyon in Arizona. B) Gwenivere on Venus. C) the Discovery Scarp of Mercury. D) Valles Marineris on Mars. E) Valhalla on Callisto.
A Carnot engine is operated as a heat pump to heat a room in the winter. The heat pump delivers heat to the room at the rate of 34 kJ per second and maintains the room at a temperature of 293 K when the outside temperature is 229 K
The power requirement for the heat pump under these operating conditions is closest to A) 7500 W. B) 6000 W. C) 17,000 W. D) 13,000 W. E) 9600 W.
The purpose of a voltage source is to provide an electrical
A) energy sink. B) field. C) pressure.
A 100-m long transmission cable is suspended between two towers. If the mass density is 2.01 kg/m and the tension in the cable is 3.00 × 10^4 N, what is the speed of transverse waves on the cable?
a. 60 m/s b. 122 m/s c. 244 m/s d. 310 m/s e. 1 500 m/s