SU2009MT2 - Phys 211 - MidTerm 2 Sample Summer 2009 1. A...

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Phys 211 - MidTerm 2 Sample Summer 2009 1. A student sits at the top of his igloo, which is 3 m in radius and is very slippery so that friction may be neglected. The student begins to slide off the igloo from rest. What is the speed of the student when he reaches the ground? = 3 A. 7.7 m/s B. 10.8 m/s C. 9.1 m/s D. 5.4 m/s E. There is not enough information. 2. A slider of mass 10 M is moving to the right with a velocity of 10 m/s on an air track. Another slider of mass M is moving to the left at 50 m/s. The two sliders collide and stick together making one slider of mass 11M. What is the approximate velocity of this resultant block (moving right is the + direction)? A. -4.5 m/s B. -50 m/s C. 50 m/s D. 0 m/s E. 4.5 m/s Page 1
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Phys 211 - MidTerm 2 Sample Summer 2009 3. A 25 kg bear slides, from rest, 8m down a lodgepole pine tree, moving with a speed of 5.7 m/s just before hitting the ground. What is the average frictional force that acts on the bear? A. 780 N B. 2450 N C. 0 N D. 1550 N E. 195 N 4. What average power will be required of a motor to move a 1000 kg elevator up to a height of 300 m in 4 minutes? A. 1.25 kW B. 735 kW C. 12.25 kW D. 75.35 kW E. 110 kW Page 2
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Phys 211 - MidTerm 2 Sample Summer 2009 5. A 10 kg mass sliding on a frictionless surface explodes into two pieces, one with mass 4 kg traveling North with speed 3 m/s, and another with mass 6 kg traveling 30° North of East with speed 5 m/s. What was the original speed (velocity magnitude) of the 10 kg mass? A. 6.77 m/s B. 3.17 m/s C. 3.75 m/s D. 2.68 m/s E. 6.08 m/s 6. An electron of mass 9.1 x 10 -31 kg has an initial speed of 3.0x10 5 m/s. It travels in a straight line, and its speed increases to 7.0x10 5 m/s in a distance of 5.0 cm. Assuming its acceleration is constant, what is the force on the electron? A. 3.6 x 10 12 N B.
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SU2009MT2 - Phys 211 - MidTerm 2 Sample Summer 2009 1. A...

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