Torque: The figure shows a person's foot. In that figure, the Achilles tendon exerts a force of magnitude F = 720 N. What is the magnitude of the torque that this force produces about the ankle joint?
A. 12 N ? m
B. 16 N ? m
C. 21 N ? m
D. 26 N ? m
E. 36 N ? m
Answer: B
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A current-carrying wire of length 50 cm is positioned perpendicular to a uniform magnetic field. If the current is 10.0 A and it is determined that there is a resultant force of 7.5 N on the wire due to the interaction of the current and field, what is the magnetic field strength?
a. 1.8 × 10^–3 T c. 6.7 × 10^–3 T b. 1.5 T d. 0.60 T
If an interstellar gas cloud shrinks in size, what does the law of conservation of angular momentum predict it will do?
A) heat up B) spin slower C) cool off D) continue shrinking E) spin faster
If a body were in orbit very near the surface of the Earth, its centripetal acceleration would be
a. equal to g. b. smaller than g. c. larger than g. d. dependent on its mass. e. none of the above.
A massive star can fuse more and more massive nuclei, but this process is limited by the fact that, at some point, an element that is produced ____
a. becomes completely degenerate in the core, changing the pressure-temperature relationship b. cannot produce energy through fusion c. will only fuse in the presence of even more massive nuclei d. is not found in nature e. decays radioactively before it can undergo fusion