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the magnitude of the free-fall acceleration at a point that is a distance Re above the surface of the
Earth, where Ro is the radius of the Earth?
A) 1.1 m/s
B) 9.8 m/s
C) 2.5 m/s
D) 9.8 m/s
E) 20 m/s
4. Which requires more net work, increasing a car's speed from 0 mph to 30 mph or from 50 mph to 60 mph?
A) 0 mph to 30 mph
B) 50 mph to 60 mph
C) It is the same in both cases.
D) It depends on the mass of the car.
E) Whichever takes a longer time requires more net work.
5. A block of weight $w = 15.0 \text{ N}$ sits on a frictionless inclined plane, which makes an angle $\theta = 22.0^\circ$ with
respect to the horizontal, as shown in the figure. A force of magnitude $F = 5.62 \text{ N}$, applied parallel to the
incline, is just sufficient to pull the block up the plane at constant speed. What is $W_N$, the work done on the
block by the normal force, as the block moves a distance $L = 2.90 \text{ m}$ up the inclined plane?
