When at rest, a spacecraft has the same height as length. When moving at relativistic speeds in the direction of its length, which one of the following describes its length and height to an observer at rest?
a. Its length is decreased and its height is increased.
b. Its length is decreased and its height is decreased.
c. Its length is decreased and its height is unchanged.
d. Its length is unchanged and its height is increased.
e. Its length is increased and its height is decreased.
c
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Many scientists suspect that Venus has a stronger and thicker lithosphere than Earth. If this is true, which of the following could explain it?
A) the high surface temperature that has "baked out" all the liquid water from Venus's crust and mantle B) the smaller size of Venus, which has allowed it to lose much more internal heat than Earth C) the slow rotation of Venus D) the apparent lack of plate tectonics on Venus
An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field?
a. negative y direction b. positive y direction c. negative z direction d. positive z direction e. negative x direction
If an x-ray beam of wavelength 1.4 × 10-10 m makes an angle of 20° with a set of planes in a crystal causing first order constructive interference, at what angle will the second order line appear?
A) 40° B) 20° C) 43° D) 4.0° E) 11°
An piece of space debris is released from rest at an altitude that is two earth radii from the center of the earth. Compared to its weight on Earth, the weight of this debris is
A) zero. B) one-quarter of its weight on the surface of the earth. C) the same as on the surface of the earth. D) one-half of its weight on the surface of the earth. E) one-third of its weight on the surface of the earth.