A paperclip with the density of a neutron star would weigh (on the Earth)
A) more than the Earth.
B) more than Mt. Everest.
C) a few tons.
D) about the same as a regular paperclip.
E) more than the Moon.
B
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A 2.0-kg object moving with a velocity of 5.0 m/s in the positive x direction strikes and sticks to a 3.0-kg object moving with a speed of 2.0 m/s in the same direction. How much kinetic energy is lost in this collision?
a. 2.4 J b. 9.6 J c. 5.4 J d. 0.6 J e. 6.0 J
What evidence has Chandra found to contradict the hypothesis that black holes merge during galaxy collisions?
A) a double black hole in a single galaxy B) a black hole without a host galaxy C) a hypermassive black hole D) a triple black hole system E) a dwarf galaxy containing a black hole
Suppose that the electric force between two objects is 2 N and that you then halve the distance between the objects. The new force is
A) 1 N. B) 0.25 N. C) 0.5 N. D) 8 N. E) 4 N.
The process of convection occurs in
A) solids. B) liquids. C) gases. D) fluids. E) none of the above