If Earth's mass decreased to one-half its original mass with no change in radius, your weight would
A) decrease to one-quarter.
B) decrease to one-half.
C) remain the same.
D) none of the above
Answer: B
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Potassium-40 decays into daughter isotopes with a half-life of _____
A) 1.25 billion years B) 1.5 billion years C) 1.75 billion years D) 2 billion years
Suppose you are sitting at the origin of an inertial reference frame. You see (that is, you receive the light from) an event E occurring near a clock at x = -30 ns at a time t = 80 ns. When do you observe that event to occur?
A. tE = 0 B. tE = 30 ns C. tE = 50 ns D. tE = 80 ns, of course E. tE = 110 ns F. Some other time (specify)
What is thermal conductivity?
What will be an ideal response?
How do elliptical galaxies typically compare to spiral galaxies?
A) Elliptical galaxies are redder and rounder. B) Elliptical galaxies are redder and flattened. C) Elliptical galaxies are bluer and rounder. D) Elliptical galaxies are bluer and flattened. E) Elliptical galaxies are always much smaller.