A car traveling at 4.0 m/s has a constant acceleration of 2.0 
After 3.0 seconds, the average velocity during the acceleration is
A. 5.0 m/s.
B. 7.0 m/s.
C. 9.0 m/s.
D. 11 m/s.
E. 13.
B. 7.0 m/s.
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Impulse: A very small 51-g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.50 ms. The ball rebounds elastically and returns to its original height. The total time interval for a round trip is 3.00 s. What is the magnitude of the average force exerted on the ball by the plate during contact with the plate?
A. 3000 N B. 1500 N C. 2490 N D. 2000 N E. 3500 N
Cosmological redshift is the result of
A) the high speeds at which galaxies move within clusters. B) the expansion of the universe. C) very old, red stars in distant galaxies. D) supermassive black holes.
Which of the following is an example of a true "wave", as that word is used in physics?
A) A water wave that is coming into the beach, like the waves that surfers use to surfboard on B) A stream flowing downhill over rocks C) Both of the above. D) None of the above.
Dark matter in galaxies and clusters of galaxies is purely hypothetical because we have no way of detecting its presence
Indicate whether the statement is true or false