A point source emits sound with a power output of 100 watts. What is the intensity (in W/m2) at a distance of 10.0 m from the source?
a. 7.96 × 10^?2
b. 7.96 × 10^?1
c. 7.96 × 10^0
d. 7.96 × 10^1
e. 7.96 × 10^?3
a
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How much heat is required to raise the temperature of a 225-g lead ball from 15.0°C to 25.0°C? The specific heat of lead is 128 J/kg ? K
A) 725 J B) 576 J C) 145 J D) 217 J E) 288 J
A particle (m = 50 g, q = 5.0 ?C) is released from rest when it is 50 cm from a second particle (Q = ?20 ?C). Determine the magnitude of the initial acceleration of the 50-g particle
a. 54 m/s2 b. 90 m/s2 c. 72 m/s2 d. 65 m/s2 e. 36 m/s2
Three resistors,
are connected in series to a 9.0 V battery. What is the power dissipated by 
A. 2.0 W B. 4.0 W C. 5.1 W D. 9.0 W E. 2.3 W
The drawing below is supposed to be a free-body diagram of a box that sits without slipping on the back of a truck that is moving to the right but is slowing down. Is the diagram correct?
A. Yes.
B. No, 
should point leftward.
C. No, the label should be .
D. No, there should be a leftward drag force.
E. No, 
should not be equal to 
.
F. No, there is some other problem (specify).