Which of the following frames would be an appropriate inertial reference frame for analyzing the effects on the earth of its gravitational interaction with the moon? In each case, answer A if the frame is appropriate, or B if it would be bad for this purpose. Except for the first case, assume the frames are nonrotating.
(a) A frame attached to the earth’s surface
(b) A frame attached to the earth’s center of mass (CM)
(c) A frame attached to the earth–moon system’s CM
(d) A frame attached to the sun’s CM
(e) A frame attached to the entire solar system’s CM
(a) A frame attached to the earth’s surface - B
(b) A frame attached to the earth’s center of mass (CM) - B
(c) A frame attached to the earth–moon system’s CM - A
(d) A frame attached to the sun’s CM - A
(e) A frame attached to the entire solar system’s CM - A
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Dr. X believes that the Hubble constant is H0 = 55 km/s/Mpc. Dr. Y believes it is H0 = 80 km/s/Mpc. Which statement below automatically follows?
A) Dr. X believes that the universe is expanding, but Dr. Y does not. B) Dr. X believes that the Andromeda Galaxy (a member of our Local Group) is moving away from us at a slower speed than Dr. Y believes. C) Dr. X believes that the universe is older than Dr. Y believes. D) Dr. X believes that the universe will someday stop expanding, while Dr. Y believes it will expand forever. E) Dr. X believes that the universe has a much higher density than Dr. Y believes.
As with our own Sun among the neighboring stars, most galaxies in the Local Group are smaller and dimmer than our own Milky Way
Indicate whether the statement is true or false
A test rocket at ground level is fired straight up from rest with a net upward acceleration of 20 m/s2. After 4.0 s, the motor turns off but the rocket continues to coast upward with insignificant air resistance
What maximum elevation does the rocket reach? A) 160 m B) 330 m C) 320 m D) 410 m E) 490 m
A liquid has a specific gravity of 0.68. What is its density?
A) 680 kg/m3 B) 1360 kg/m3 C) 1000 kg/m3 D) 6800 kg/m3