A mass attached to a vertical spring causes the spring to stretch and the mass to move downwards. What can you say about the spring's potential energy (PEs) and the gravitational potential energy (PEg) of the mass?
a) both PEs and PEg decrease
b) PEs increases and PEg decreases
c) both PEs and PEg increase
d) PEs decreases and PEg increases
e) PEs increases and PEg is constant
Ans: b) PEs increases and PEg decreases
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Which of the following best explains what scientists think happened to outgassed water vapor on Venus?
A) Ultraviolet light split the water molecules, and the hydrogen then escaped to space. B) Water was removed from the atmosphere by chemical reactions with surface rock. C) It is frozen as water ice in craters near the poles. D) It turned into carbon dioxide by reacting with nitrogen in Venus's atmosphere.
How much energy is in a 63 kHz photon of AM-radiation?
a. 1.0 × 10^-38 J b. 6.6 × 10^-30 J c. 4.2 × 10^-29 J d. 3.1 × 10^-30 J e. 13 × 10^-29 J
Work is the process by which energy is ______________
Fill in the blank(s) with correct word
The principal difference between a gas and a plasma has to do with
1) the kinds of elements involved, 2) interatomic spacing, 3) electrical conduction, 4) fluid pressure, 5) the proportion of antimatter, while the principal difference between a liquid and a gas has to do with 6) the kinds of elements involved. 7) interatomic spacing. 8) electrical conduction. 9) fluid pressure. 10) the proportion of antimatter.