A child is riding a merry-go-round which completes one revolution every 8.36 s. The child is standing 4.65 m from the center of the merry-go-round. What is the tangential speed of the child?
A) 5.64 m/s
B) 3.49 m/s
C) 0.556 m/s
D) 1.75 m/s
E) 1.80 m/s
B
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An engineer wants to use a river (minimum temperature of 
to cool his electrical plant which heats water with a boiler operating at 
If he wishes to produce 185 kW of power using this plant, what is the minimum energy he must supply to his boiler if it is maximally efficient?
A. 233 kW B. 187 kW C. 332 kW D. 418 kW
Size of the Nucleus: How many nucleons would you expect a nucleus to contain if its diameter is 13.4 fm?
Fill in the blank(s) with the appropriate word(s).
The vast numbers of electrons in a coin don't fly off the surface because
A) mutual repulsion is incomplete. B) they are attracted by an equal number of protons. C) they are strongly bonded to their atoms. D) all of the above E) none of the above
Observations of young stars suggest that when the Sun was young, the solar wind
A) was weaker than it is today. B) was stronger than it is today. C) was about the same strength as it is today. D) was nonexistent. E) blew outward only along the Sun's poles.