What is the power output of a hot air furnace that produces heat at the rate of 160,000. BTU/hr?
A) 22 kW
B) 80 kW
C) 47 kW
D) 7.6 kW
E) 1.6 kW
C
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Why does the nuclear force have a short range?
a. Because the exchanged particles have nonzero mass, and thus limited time before they can complete the exchange. b. Because the low mass of the exchange particles means their exchange is effective only over short distances. c. Because the exchange particles have zero mass and thus limited time before they can complete the exchange. d. Because the exchanged particles must travel long distances to complete the exchange. e. Because it is the weakest of the four forces.
In a relay race, runner A is carrying the baton and has a speed of 2.8 m/s. When he is 25 m behind the starting line, runner B starts from rest and accelerates at 0.080 m/s2. How fast is B traveling when A overtakes her?
A) 0.10 m/s B) 0.33 m/s C) 0.84 m/s D) 2.0 m/s E) Runner A never catches up.
Energy in Nuclear Reactions: When a neutron collides with a uranium-235 nucleus it can induce a variety of fission reactions. One such reaction is src="https://sciemce.com/media/4/ppg__cp1pbb0313192044__f440g1q11g6.jpg" style="vertical-align: -21.0px;" />Xe: 139.921620 u
U + 
n ? 
Xe + 
Sr + 2 
nThe following mass values are known:
Sr: 93.915367 u
U: 235.043924 u
n: 1.008665 uHow much energy is released in this reaction? (1 u = 931.5 MeV/c2)
A. 185 MeV
B. 202 MeV
C. 32.6 MeV
D. 65.7 MeV
E. 98.6 MeV
Mass on a Spring: An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its elastic potential energy is a maximum?
A. at either A or B B. midway between A and B C. one-third of the way between A and B D. one-fourth of the way between A and B E. at none of these points