Phys201_f09_exam2 - Name Section TA Physics 201 Fall 2009...

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Name______________________________________ Section #: _______ TA:_____________ Physics 201 Fall 2009 Exam 2 October 27, 2009 1. A mass m is traveling at an initial speed v 0 = 25.0 m/s. It is brought to rest in a distance of 62.5 m by a force of 15.0 N. The mass is A) 37.5 kg B) 3.00 kg C) 1.50 kg D) 6.00 kg E) 3.75 kg 2. Rachel has been reading her physics book. She takes her weighing scales into an elevator and stands on them. If her normal weight is 690 N (155 lbs), and the elevator moves upward at 0.25 g and then down at 0.25 g , what is the difference between the up and down scale readings? A) 690 N B) 520 N C) 170 N D) 345 N E) 1040 N 3. An astronaut lands on an Earthlike planet and drops a small lead ball with a mass of 76.5 g from the top of her spaceship. The point of release is 18 m above the surface of the planet and the ball takes 2.5 s to reach the ground. The astronaut's mass on Earth is 68.5 kg. Her weight on the planet is A) 69.0 N B) 395 N C) 670 N D) 990 N E) 1020 N
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Name______________________________________ 4. A boy sits in a tire that is attached to a rope that passes over a pulley fastened to the ceiling and then passes back down to the boy's hands. The weight of the boy plus the tire is W. The force with which the boy must pull on the free end of the rope to support his weight in the tire is A) (1/2) W B) W C) 2 W D) (2/3) W E) (3/2) W
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