Sample Exam: Exam #2, Version B

# Sample Exam: Exam #2, Version B - Physics 116A Section 2...

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Physics 116A, Section 2, Second Exam Version B, 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. Figure 1 1) 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. 1. The puck lands a horizontal distance of 6.20 m from the foot of the cliff with no air resistance. Its speed v 0 when it started at the bottom of the hill is closest to: (HINT: the hockey puck is traveling horizontally when it leaves the top of the cliff.) A) 4.71 m/s B) 14.4 m/s C) 20.8 m/s D) 13.7 m/s E) 17.4 m/s 1) 2) 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) 524 w B) 6.65 kw C) 4.34 kw D) 3.92 kw E) 1.13 kw 2) 1

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Figure 2 3) Blocks A and B of masses 19 kg and 15 kg, respectively, are connected by a rope, which passes over a light frictionless pulley, as shown. The horizontal surface is rough. The coefﬁcients of static and kinetic friction are 0.40 and 0.20, respectively. External forces P and Q act on block B , as shown. In Fig. 2, force P equals 60 N. The maximum value of force Q , for which the system remains at rest is closest to: A) 230 N B) 270 N C) 220 N D) 240 N E) 190 N 3) 4) A girl of mass 60 kg throws a ball of mass 0.8 kg against a wall. The ball strikes the wall horizontally with a speed of 11 m/s, and it bounces back with this same speed. The ball is in contact with the wall 0.05 s. What is the average force exerted on the wall by the ball? A) 350 N B) 6600 N C) 180 N D) 13,200 N E) 26,400 N 4) 2
5) A mass is pressed against (but is not glued to) an ideal (massless) horizontal spring on a frictionless horizontal surface. After being released from rest, the mass acquires a maximum speed v and a maximum kinetic energy K . If instead the mass initially compresses the spring twice as far: A) Its maximum speed will be 2 v

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Sample Exam: Exam #2, Version B - Physics 116A Section 2...

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