A typical public utility (power company) supplies electricity at an approximate cost of
A) 10.¢/kW ? h.
B) $10./kW ? h.
C) 1.¢/kW ? h.
D) $1./kW ? h.
E) $100./kW ? h.
A
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At what rate is thermal energy generated in the 20-? resistor when ? = 20 V?
a.
6.5 W
b.
1.6 W
c.
15 W
d.
26 W
e.
5.7 W
Calculate the light intensity 1.51 m from a light bulb that emits 100 W of visible light, assuming that the light radiates uniformly in all directions
A) 3.49 W/m2 B) 4.01 W/m2 C) 43.9 W/m2 D) 50.5 W/m2
The possible fate of a neutron in ordinary uranium metal is to
A) cause fission of U-235 if present. B) escape the metal. C) be absorbed by U-238 without causing fission. D) all of the above E) none of the above
A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about normal force F on the block due to the ramp?
A) F > mg B) F > mg cos ? C) F > mg sin ? D) F = mg cos ? E) F = mg sin ?