A proton is accelerated from rest through a potential difference of 150 V. It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm). What is the magnitude of the magnetic field in this region?
a. 18 mT
b. 12 mT
c. 15 mT
d. 22 mT
e. 10 mT
c
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The speed of light changes when it goes from ethyl alcohol (n = 1.36) to carbon tetrachloride (n = 1.46). The ratio of the speed in carbon tetrachloride to the speed in ethyl alcohol, v2/v1, is
a. 1.99. b. 1.07. c. 0.932. d. 0.511. e. 0.760.
The captain of spaceship A observes enemy spaceship E escaping with a relative velocity of 0.48c, as shown in the figure. A missile M is fired from ship A, with a velocity of 0.72c relative to ship A
What is the relative velocity of approach of missile M, observed by the crew on ship E? A) 0.37c B) 0.24c C) 0.34c D) 0.30c E) 0.27c
A particle with an integer spin is a
a. boson b. lepton c. fermion d. hadron e. muon
A boat floating in a large pool is loaded with solid iron bars. The water level at the pool's edge is marked with a red line. The iron is now thrown overboard. When the water becomes calm again,
A. the red line is slightly lower than the water level. B. the red line is still at the water level. C. the red line is slightly higher than the water level.