A torque of 20.0 N•m is applied to a bolt. The bolt rotates through an angle of 180 degrees. The work done in turning the bolt is
A. 72.5 J.
B. 51.9 J.
C. 62.8 J.
D. 49.9 J.
E. 58.4 J.
C. 62.8 J.
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What use are 21-cm radio waves to galactic astronomers?
A) They bounce off stars like our Sun to let us precisely measure their distances. B) We can reflect them off the core of the Galaxy. C) They pick up the cool, dark matter much better than can optical telescopes. D) They cut through the dusty cocoons to let us watch star birth. E) Their Doppler shifts let us map the motions and locations of gas in the spiral arms.
As a block slides down a frictionless incline, which of the following statements is true?
a. Both its speed and acceleration increase. b. Its speed increases and its acceleration remains constant. c. Its speed and acceleration remain constant. d. Its speed increases and its acceleration decreases. Both its speed and acceleration decrease.
The electric energy density in an electromagnetic wave is higher than its magnetic energy density
Indicate whether the statement is true or false
The description large somewhat dirty snowball model fits the physical structure of ____________________
Fill in the blank(s) with correct word