Film behind a double slit is exposed to light in the following way: First one slit is opened and light is allowed to go through that slit for time ?t. Then it is closed and the other slit is opened and light is allowed to go through that slit for the same time ?t. When the film is developed the pattern will be
a. one single slit pattern.
b. two superimposed single slit patterns, their centers displaced from each other by the distance between the two slits.
c. one double slit pattern.
d. two double slit patterns, their centers displaced from each other by the distance between the two slits.
e. random darkening of the film. (no pattern at all)
b
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Precession of the rotation axis of Earth is caused by
a. the force of gravity from the Sun and Moon on Earth's equatorial bulge. b. the force of gravity from the Sun and Jupiter on the Earth-Moon system. c. the magnetic field of Earth. d. the formation and subsequent melting of glaciers during the ice-ages. e. the impact of asteroids.
The mass density of platinum is 21.4 × 103 kg/m3. A platinum wire with a radius of 0.500 mm, 1.20 m long, fixed at both ends has a frequency of vibration for its third harmonic equal to 512 Hz. What is the tension in the wire?
A) 4.00 kN B) 2.00 kN C) 2.82 kN D) 1.41 kN E) 1.00 kN
It is believed that ring galaxies form
a. when two galaxies collide at high speeds. b. when two spiral galaxies collide, but not directly head on. c. from a large cloud of gas and dust with very little angular momentum. d. from a large cloud of gas and dust with a very high angular momentum. e. when more than two galaxies collide at the same time.
Structure 1 with member BC of length L/2 has force P1 applied at joint C. Structure 2 with member BC of length L has force P2 applied at C. Both structures have constant flexural rigidity EI. The required ratio of the applied forces P1/P2 so that joint B rotations ?B1 and ?B2 are equal is approximately:
(A) 1
(B) 5/4
(C) 3/2
(D) 2