3. [2pt] Two masses are attracted by a gravitational force of 0.25 N. What will

Question

3. [2pt] Two masses are attracted by a gravitational force of 0.25 N. What will the force of attraction be if the distance between these two masses is halfed. A) 0.50 N B) 0.25 N C) 0.125 N D) 1.00 N E) 0.062 N 4. [2pt] A 3100-lbs car is driving down a ramp inside a garage at constant speed. Which of the following statements about the force of friction exerted from the road on the tires is correct? A) The frictional force is opposite to the normal force. B) Without knowing the speed, this cannot be answered . C) There is no friction. D) The frictional force points up the incline. E) The friction force is directed down the incline.

Explanation / Answer

3. F = GMm / d^2

d - halfed => F - 4 time

F' = 4F = 4 x 0.25 = 1 N

Ans. D

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4. friction is oppsite of component of gravity along incline so

points up the incline

Ans. D

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