If you know the impulse that has acted on a body of mass m you can calculate
A. its initial velocity.
B. its final velocity.
C. its final momentum.
D. the change in its velocity.
E. its acceleration during the impulse.
Answer: D
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A 5-kg fish swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is
A) 1/2 m/s. B) 2/5 m/s. C) 5/6 m/s. D) 6/5 m/s. E) 1 m/s.
If a spring-operated gun can shoot a pellet to a maximum height of 100 m on Earth, how high could the pellet rise if fired on the Moon, where g = 1.6 m/s2?
A) 17 m B) 160 m C) 3.6 km D) 100 m E) 610 m
You are standing on a bathroom scale in an elevator that is not moving and it reads 500 N. The elevator then moves downward at a constant velocity of 4.50 m/s. What does the scale read?
A. 100 N B. 450 N C. 500 N D. 750 N E. 250 N
Recent measurements of the expansion rate of the universe reveal that the expansion rate of the universe is doing something astronomers did not expect. What is that?
A) The measurements show that the universe may not be expanding at all. B) The measurements show that the universe may be shrinking rather than expanding. C) The measurements show that the expansion is accelerating, rather than slowing under the influence of gravity. D) The measurements indicate that the universe is at least 30 billion years old, meaning that more than 10 billion years passed between the Big Bang and the formation of the first stars and galaxies. E) The data show that the expansion rate varies widely in different parts of the universe.