116SP08_SecondExam_ScramA

116SP08_SecondExam_ScramA - Physics 116A, Section 2, Second...

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Physics 116A, Section 2, Second Exam A, February 26, 2008 Name (Please print)___________________________________ Mulitiple choice questions are worth 3 points each. Mark your answers in the space provided at the right, and on the OPSCAN sheet MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A sand mover at a quarry lifts 2,000 kg of sand per minute a vertical distance of 12 meters. The sand is initially at rest and acquires a speed of 5 m/s at the top of the sand mover where it is then discharged into a loading chute. At what rate must power be supplied to this machine, neglecting any frictional losses? A) 4.34 kw B) 3.92 kw C) 524 w D) 1.13 kw E) 6.65 kw 1) 2) A baseball is thrown vertically upward and feels no air resistance. As it is rising which of the following is true, where "conserved" is the same meaning here as "constant": A) Its momentum is not conserved, but its total mechanical energy is conserved. B) Its gravitational potential energy is not conserved, buts its momentum is conserved. C) Both its momentum and its kinetic energy are conserved. D) Its kinetic energy is conserved, but its momentum is not conserved. E) Both its momentum and its mechanical energy are conserved. 2) 3) A constant horizontal force acts on a sled on a horizontal frictionless ice pond. The sled starts from rest. When the pull acts over a distance x, the sled acquires a speed v and a kinetic energy K . If the same force instead acts over twice this distance: A) The sled’s speed will be 2 v and its kinetic energy will be K . B) The sled’s speed will be 4 v and its kinetic energy will be 2 K . C) The sled’s speed will be 2 v and its kinetic energy will be K . D) The sled’s speed will be v and its kinetic energy will be 2 K . E) The sled’s speed will be v and its kinetic energy will be K . 3) 1
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Figure 1 4) In Fig. 1, four point masses are placed as shown. The x - and y - coordinates of the center of mass are closest to: A) (2.3, 2.8) B) (2.2, 2.7) C) (2.2, 2.6) D) (2.3, 2.6) E) (2.3, 2.7) 4) Figure 2 5) A small hockey puck slides without friction to the top and then over the icy hill, which has a height 8.5 meters above where the puck originally started, as shown in Fig. 2. The puck lands a horizontal distance of 6.20 m from the foot of the cliff with no air resistance.
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116SP08_SecondExam_ScramA - Physics 116A, Section 2, Second...

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