MULTIPLE CHOICE. Choose the one alternative that best completes the statement or

Question

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Enter answer into table on page 1. 1) A girl attaches a rock to a string, which she then swings counter-clockwise in a horizontal circle. The string breaks at point P in the figure, which shows a bird's-eye view (as seen from above). Which path (A- E) will the rock follow? A) Path A B) Path BC) Path CD) Path D E) Path E 2) A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point A) perpendicular to the ramp B) vertically downward. C) up the ramp. D) down the ramp. E) None of the above choices is correct. 3) A truck is using a hook to tow a car whose mass is one quarter that of the truck. If the force exerted by the truck on the car is 6000 N, then the force exerted by the car on the truck is A) 1500 N. B) 6000 N. C) 12000 N. D) 24000 N. E) We need to know if the car is accelerating to answer this question. 4) A person is using a rope to lower a 5.0-N bucket into a well with a constant speed of 2.0 m/s. What is the magnitude of the force exerted by the rope on the bucket? A) 5.0 N B) 2.0 NC) 49 N D) 0.00 N E) 10 N 5) If I weigh 655 N on Earth at a place where g-9.80 m/s2 and 5320 N on the surface of another planet, what is the acceleration due to gravity on that planet? A) 58.1 m/s2 B)91.5 m/s2 C)69.3 m/s2 D)79.6 m/s2 6) An astronaut weighs 99 N on the Moon, where the acceleration of gravity is 1.62 m/s2. How much does she weigh on Earth? A) 440 N B) 99 N C) 16 ND) 61 NE) 600 N

Explanation / Answer

(5) mg=655 N with g=9.80 m/s^2

mass m=66.836 kg

then the acceleration

ma=5320 M

a=79.59 = 79.6 [D]

6) mx1.62=99N

m=61.111 kg

then weight on earth = mg=598.888 N

which is approximately 600 Newton

Answer - E

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