Two identical rocks are placed in a furnace on a cold day. One of the rocks is removed a few minutes before the other and allowed to cool and then the other is removed. Both are set outside. At this point, one rock has a temperature that is twice that of its surroundings (on a Kelvin scale) and the other has a temperature that is three times that of its surroundings (a very hot rock!). The ratio
of the power radiated by the very hot rock to that radiated by the hot rock is approximately
1.3:2
2.9:4
3.5:1
4.2:1
3
Physics & Space Science
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A pair of parallel conducting plates have potentials of -17 V and 55 V, respectively. An electron is ejected from the plate at potential -17 V and travels to the plate at 55 V. What is the change in the electron’s potential energy as it makes this journey?
a. 
b. 
c. 
d. 
Physics & Space Science
The WAI guidelines that you should use should use HTML to specify fonts.
Answer the following statement true (T) or false (F)
Physics & Space Science
Why does the merger of two spiral galaxies often trigger starbursts?
What will be an ideal response?
Physics & Space Science
The frequency of a wave is measured in
a) hertz. b) vibrations per meter. c) meters per second. d) cycles. •
Physics & Space Science