The fastest we could accelerate a chemical rocket to (assuming using 100 stages!) is approximately
A) 50% of the speed of light
B) 0.001% of the speed of light
C) 0.1% of the speed of light
D) 100% of the speed of light
C
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A cart starting from rest rolls down a hill and at the bottom has a speed of 4 m/s. If the cart were given an initial push, so its initial speed at the top of the hill was 3 m/s, what would be its speed at the bottom?
a) 4 m/s b) 5 m/s c) 6 m/s d) 7 m/s e) 25 m/s
Which of the following has the effect of reducing the gravitational force between two objects?
A) Increasing the mass of either one of the objects. B) Moving the two objects closer together. C) Both of the above. D) Moving the two objects farther apart. E) None of the above.
The symbol for lead is
a. Pb. b. La. c. Li. d. Xe.
Neutron stars are expected to spin rapidly because
a. they conserved angular momentum when they collapsed. b. they have high orbital velocities. c. they have high densities. d. they have high temperatures. e. the energy from the supernova explosion that formed them made them spin faster.