A 4.00 kg mass is moving in a circular path of radius 2.50 m with a constant angular velocity of 5.00 rad/sec. The centripetal force on the mass is
A. 250 N.
B. 185 N.
C. 153 N.
D. 107 N.
E. 94.0 N.
A. 250 N.
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A CD has a diameter of 12.0 cm. If the CD is rotating at a constant frequency of 4.00 cycles per second, then the period of the rotational motion is
A. 0.250 s. B. 0.500 s. C. 0.750 s. D. 1.00 s. E. 1.25 s.
Exhibit 12-1
The figure below shows a graph of angular velocity versus time for a woman bicycling around a circular track.
?
?
Use this exhibit to answer the following question(s).
Refer to . How many revolutions does she complete in the first 12 minutes?
a.
4
b.
8
c.
12
d.
16
e.
32
A solenoid of length 4.00 cm and cross-sectional area 2.00 cm2 has 80 turns. What is its self- inductance?
A. 160 
H
B. 120 H
C. 80.0 H
D. 40.0 H
E. 0.500 H
The current (measured in amperes) in a circuit is
A. never lethal if the current is due to positive charges. B. the total number of electrons in the circuit. C. the amount of the total energy carried by 1 Coulomb of charge. D. the amount of charge (measured in Coulombs) that passes a point (in the circuit) in 1 second.