PHYS-111 General Physics I (Purcell) Midterm Exam #3 Summer 2016 Name Multiple C
ID: 1418463 • Letter: P
Question
PHYS-111 General Physics I (Purcell) Midterm Exam #3 Summer 2016 Name Multiple Choice (Q1-Q14, 2 points each) Please circle the correct answer clearly! 1. A wooden rod is freely hanging from a hook in the ceiling, and the rod is covered in flypaper A fly, traveling horizon lands on the flypaper rod and sticks there. Which statement is true? A. the angular momen m of the system (fly and rod) is conserved Hook about the hook because only gravity is acting on the system B. the ang of the system (fly and rod) is co erved ome about the hook because neither the hook nor gravity exerts a torque on this system about the hook C. both the angular momentum of the system (fly and rod) and its kinetic energy are conserved. D. both the linear momen m and the angular momen m of the system (fly and rod) are conserved E. the angular momentum of the system (fly and rod) is not conserved because the fly exerts a force on the rod 2. A dune buggy is traveling south at 5.0 m/s. The mass of the buggy's tire, 5.0 kg, is uniformly distributed along the rim, which has a radius of 20 cm. What are the magnitude and direction of the omentum of the e about its axis? angula A. 5.0 kg m /s vertically upwards B. 2.0 kg m /s towards the east C. 5.0 kg m/s towards the west D. 2.0 kg m /s ards the west E. 5.0 kg m /s towards the east 3. If point P begins on the x-axis at est, and starts rotating at the angular acceleration shown b what is its tangential speed (not the anguiar speed) when it reaches the y-axis? 0.019 rad/s A. 0.35 m/s B. 0.49 m/s D. 0.18 m/ PHYS-111 General Physics I (Purcell) Midterm Exam #3 Summer 2016 4. In the figure, the horizontal lower arm has a mass of 2.9 kg and its center of gravity is 14 cm from the elbow joint pivot. How much force FM must the vertical extensor muscle in the upper arm exert on the lower arm to hold a 9.5 kg shot put in static equilibrium? Shot put 2.5 cm 30.0 cm Lower Elbow Joint armh M. Upper A. 1500 N B. 130 N C. 100 N D. 1000 N E. 500 N 5. As you open a door, it pushes away from you, and the hinges are on your right. In what direction is the angular velocity vector of the door as it opens? A. down B. up C. left gh 6. If two forces of equal magnitude act on an object that is hinged at a pivot, the force acting farther from the pivot must produce the larger torque about the pivot A. True B. False 7. If the torque on a ball adds up to zero, the ball could be both rotating and accelerating linearly. A. True B. False 8. A wheel is rolling without slipping, with a linear veloci v. If we attach a piece of tape to the wheel when the piece of tape is touching the road (at the bottom of the wheel), its velocity with respect to the oad is A. 2 B. v C. 1.5 9. The angular momentum of a system remains constant when a constant torque act upon it. A. True B. FalseExplanation / Answer
option (A)is true becuase collision is ineleastic so, kinetic energy is not conserved
L = mvr
=5(5) 0.2
=5 kg m^2 /s
option (e) is correct answer
(3)
wf^2 = 2 alpha ( theta)
= 2( 0.019) ( pi/2)
wf = 0.244
v = rw = 0.244*2 m = 0.49 m/s
As per guide liens I worked first three parts please post remianing posts next time
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