You see a positively charged helium ion in space, and it is at rest with respect to your spacecraft. Since you are studying for the final exam, you decide to experiment. You slowly push the N pole of a bar magnet closer to the helium ion. What happens to the helium ion?
A. It depends on whether it is a positive ion or a negative ion
B. It experiences a magnetic force and moves off
C. Nothing happens, because the ion is not moving
Answer: C
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A 1 000-kg sports car accelerates from zero to 25 m/s in 7.0 s. What is the average power delivered by the automobile engine?
a. 8.9E+4 W b. 1.8E+3 W c. 4.5E+4 W d. 1.8E+5 W e. 5.4E+4 W
When a star collapses to become a black hole, its mass
A) increases. B) decreases. C) remains unchanged.
A 2000 kg car accelerates up to a velocity of 40 m/s in 5.0 seconds. The brakes are applied, and the car is brought to a stop. The work done by the friction in the brakes is
A. 
B. 
C. 
D. 
E. 
Why is Saturn oblate?
a. The gravity of its moons flattens the planet. b. The rapid rotation of the planet flattens it. c. It formed that way originally and has no way to reshape itself. d. The magnetic fields of Jupiter and Saturn interact and cause the planet to flatten.