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

Physics & Space Science

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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

Physics & Space Science

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.

Physics & Space Science

Which of the following represents one of the major splits in physical science before and after about 1895?

The loss of the feeling that everything in nature could be understood through reasoning with the introduction of quantum mechanics after about 1895. With the explanation of blackbody radiation in 1887, after 1895 the world worked towards modeling quantum mechanics. The ether was found to exist and was generally accepted after about 1895 as the electromagnetic medium. Both matter and light appeared to be best modeled by a wave rather than a particle after about 1895.

Physics & Space Science

Absolute zero is the temperature of

A. frozen water B. the Universe C. liquid helium D. nothing

Physics & Space Science