A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 20 radians per seconds, then the tangential velocity of a point on the circumference is
A. 2.0 m/s.
B. 1.9 m/s.
C. 1.5 m/s.
D. 1.2 m/s.
E. 1.0 m/s.
D. 1.2 m/s.
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An inductor, battery, resistor, ammeter, and switch are connected in series. If the switch, initially open, is now closed, what is the current's final value?
a. zero b. battery voltage divided by resistance c. battery voltage times inductance d. battery voltage divided by inductance
Eras are divided first into
a. epochs. b. millennia. c. periods. d. eons.
Forces and couples are applied to ABCDE as shown in the figure. All turns of ABCDE are 90o angles. The statically equivalent moment at A (MA) for the force2couple system is (in N?m)
(A) 2160i 1 575j 1 1480k
(B) 160i 1 425j 1 1380k
(C) 2160i 1 325j 1 1380k
(D) 2160i 1 325j 2 1480k
A particular material has an index of refraction of 1.25 . What percent of the speed of light in a vacuum is the speed of light in the material?