Joe and Bill are playing tug-o-war. Joe is pulling with a force of 200 N. Bill is simply hanging on to the rope. Neither person is moving. What is the tension of the rope?
A) 200 N
B) 400 N
C) 0 N
D) 300 N
A
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A star leaves the main sequence when
A. it stops fusing hydrogen in its core and starts to expand. B. it collapses, and its envelope becomes degenerate. C. nuclear fuel in its core can supply enough energy to stop its collapse. D. it forms planets.
Compared to the summer, the atmospheric pressure above a Martian polar cap in winter is
A) lower B) about the same C) slightly higher D) much higher
Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. If it is doubly ionized, what is the charge of the gold ion and how many electrons remain in the ion?
A) The gold ion has a charge of +2 and 77 electrons. B) The gold ion has a charge of +2 and 79 electrons. C) The gold ion has a charge of -2 and 77 electrons. D) The gold ion has a charge of +2 and 2 electrons. E) The gold ion has a charge of +79 and no electrons.
The figure shows the orientation of a flat circular loop consisting of 50 closely wrapped turns each carrying a current I. The magnetic field in the region is directed in the positive z direction and has a magnitude of 50 mT. The loop can turn about the y axis. If ? = 20°, R = 0.50 m, and I = 12 A, what is the magnitude of the torque exerted
on the loop?
?
?
a.
8.1 N ? m
b.
24 N ? m
c.
22 N ? m
d.
13 N ? m
e.
16 N ? m