A chunk of ice (T = -20°C) is added to a thermally insulated container of cold water (T = 0°C). What happens in the container?
A)
The ice melts until thermal equilibrium is established.
B)
The water cools down until thermal equilibrium is established.
C)
Some of the water freezes and the chunk of ice gets larger.
D)
none of the above
C
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Mike performed 5 J of work in 10 secs. Joe did 3 J of work in 5 secs. Who produced the greater power?
a) Mike produced more power b) Joe produced more power c) both produced the same amount of power
If a new force were discovered that had a range on the order of 10-18 meters: (a) predict the mass of the exchange particle. (b) how long is conservation of energy violated in the exchange of this particle?
What will be an ideal response?
A pair of action-reaction forces always
A) act on the same object. B) occur simultaneously. C) comprise a pair of interactions. D) all of the above E) none of the above
Contrast the sizes of molecular clouds with emission nebulae
What will be an ideal response?