A 40-kg boy is standing on the edge of a stationary 30-kg circular platform that is free to rotate. The boy tries to walk around the platform in a counterclockwise direction. As he does:
a. the platform doesn't rotate.
b. the platform rotates in a clockwise direction just fast enough so that the boy remains stationary relative to the ground.
c. the platform rotates in a clockwise direction while the boy goes around in a counterclockwise direction relative to the ground.
d. both go around with equal angular velocities but in opposite directions.
c
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Assume a diatomic molecule can be considered to be two point masses separated by a distance r. The center of mass of the system is located a distance x from m1, equal to
a. m1r/(m1 + m2) b. m2r/(m1 + m2) c. (m1 + m2) r/m1 d. (m1 + m2) r/m2 e. r(m2/m1)
The cost of oil as sold does not include all the concomitant costs, such as those for pollution, the cost of maintaining a defense establishment to protect oil supply, etc
What will be an ideal response?
Two point sources of light of wavelength 600 nm are being viewed by a telescope of aperture width 2.0 cm. What is the closest angular separation at which the two sources can be resolved?
a. 
b. 
c. 
d. 
e. 
Power: A series ac circuit has a reactance of 11 k? due to its capacitance, a reactance of 3 k? due to its inductance, and a resistance of 29 k?. What is the power factor of this circuit?
A. 0.96 B. 0.27 C. 1.04 D. 0.48