A hollow spherical planet is inhabited by people who live inside it, where the gravitational field is zero. When a very massive spaceship lands on the planet's surface, inhabitants find that the gravitational field inside the planet is
A) still zero.
B) non-zero, directed toward the spaceship.
C) non-zero, directed away from the spaceship.
Answer: B
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Cepheid and RR Lyrae variable stars change their brightness by ____
a. atmospheric explosions of hydrogen gas b. internal changes in their fusion processes c. a combination of atmospheric explosions and internal changes d. a combination of atmospheric explosions and physically pulsating e. changing its period between pulses
Two bodies of equal mass m collide and stick together. The quantities that always have equal magnitude for both masses during the collision are
A. their changes in momentum. B. the force each exerts on the other. C. their changes in kinetic energy. D. all of the above. E. only (a) and (b) above.
Only two forces act on a 3.0-kg mass. One of the forces is 9.0 N east, and the other is 8.0 N in the direction of 62° north of west. What is the magnitude of the acceleration of the mass?
a. 2.0 m/s2 b. 2.4 m/s2 c. 3.3 m/s2 d. 2.9 m/s2 e. 5.7 m/s2
If a source of light is moving away at 10% the speed of light, its wavelength will
A) be lengthened by 22%. B) be lengthened by 11%. C) be shortened by 22%. D) be shortened by 11%. E) remain unchanged.