A wheel rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity increases to 40 rad/s. Assume that the angular acceleration was constant during the 5.0-s interval. How many revolutions does the wheel turn through during the 5.0-s interval?
a. 20 rev
b. 24 rev
c. 32 rev
d. 28 rev
e. 39 rev
b
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Energy in Capacitors: When a 6.00-?F air-filled capacitor has a charge of ±40.0 ?C on its plates, how much potential energy is stored in this capacitor?
A. 103 ?J B. 113 ?J C. 123 ?J D. 133 ?J E. 143 ?J
An isolated black hole in space would be difficult to detect because
a. there would be no light source nearby.
b. it would not be rotating rapidly.
c. it would be stationary.
d. very little matter would be falling into it.
e. there would be very few stars behind it whose light the black hole could block out.
Which of the following represents one of the major splits in physical science before and after about 1895?
Absolute zero is the temperature of
A. frozen water B. the Universe C. liquid helium D. nothing