The energy stored in the earth's magnetic field with a strength of 0.5 × 10-4 T in a room 3.0 m by 4.0 m by 2.4 m is
A)
570 mJ.
B)
29 mJ
C)
10 mJ.
D)
100 mJ.
E)
zero.
B
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a. is moving to the right. b. is moving to the left. c. is at rest. d. has less kinetic energy than the system had before the collision.
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The observed relativistic length of a super rocket moving by the observer at 0.70c will be what factor times that of the measured rocket length if it were at rest?
a. 0.55 b. 0.71 c. 0.51 d. 1.4 e. 1.8