What is the magnetic force on a 2.0-m length of (straight) wire carrying a current of 30 A in a region where a uniform magnetic field has a magnitude of 55 mT and is directed at an angle of 20° away from the wire?
a. 1.5 N
b. 1.3 N
c. 1.1 N
d. 1.7 N
e. 3.1 N
c
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What key evidence suggests that Triton is a captured moon?
A) Triton orbits Neptune in a direction opposite that of Neptune's rotation. B) Triton is small and potato-shaped, which is common of captured moons. C) Triton is too large to have been formed in the "miniature solar nebula" thought to have surrounded Neptune in its early history. D) Triton appears to be made mostly of ice.
A ceiling fan is turned on and reaches an angular speed of 132 rev/min in 20 s. It is then turned off and coasts to a stop in an additional 40 s. The ratio of the average angular acceleration for the first 20 s to that for the last 40 s is which of the following?
a. 6.6 b. 6.4 c. ?0.15 d. ?2.0
Applications to Astronomy: A Hertzsprung-Russell diagram shows stars on a plot of
A. apparent brightness vs. temperature. B. luminosity vs. temperature. C. luminosity vs. distance. D. magnitude vs. apparent brightness.
A block slides down a frictionless inclined ramp and experiences no significant air resistance. If the ramp angle is 17
0° above the horizontal and the length of the surface of the ramp is 20m find the speed of the block as it reaches the bottom of the ramp, assuming it started sliding from rest at the top. A) 7.57 m/s B) 19.6 m/s C) 114 m/s D) 10.7 m/s