I left five 100. watt bulbs burning in my basement for two weeks. If electricity costs me 10.¢/kw-h, how much did the electricity cost (to the nearest dollar) to leave these bulbs on and how many Joules of electrical energy did they consume?
What will be an ideal response?
$17. and 6.05 × 108 Joules
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Radiation: A giant star radiates energy at the rate of 3.0 × 1030 W, and its surface temperature has been measured to be 3000 K. Assuming that it is a perfect emitter, what is the radius of this star?(? = 5.67 × 10-8 W/m2 ? K4)
A. 7.8 × 1010 m B. 8.7 × 1010 m C. 1.4 × 1010 m D. 1.9 × 1011 m E. 2.3 × 1011 m
Volcanic activity on Venus is thought to be:
A) more frequent, but less violent than volcanic activity on Earth. B) more frequent and more violent than volcanic activity on Earth. C) less frequent, but more violent than volcanic activity on Earth. D) less frequent and less violent than volcanic activity on Earth. E) the same as volcanic activity on Earth.
Where did the elements heavier than hydrogen and helium come from?
A) They were produced in the Big Bang. B) They evolved from hydrogen and helium shortly after the Big Bang. C) They were produced inside dense interstellar gas. D) They were produced inside stars. E) All of the above
The number of moons in orbit around Mars is
A) zero. B) one. C) two. D) three.