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# mid2key - Midterm II (Physics 3A) Name_, ID_, Discussion_...

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Midterm II (Physics 3A) Name_________________, ID___________________, Discussion_______________ Multiple choices (8% each) 1. A heavy packing case is pulled by a force F exerted at a 30° angle, and pushed by a force P exerted horizontally. If the surface is frictionless, the equation of motion of the packing case is 30° F P a. Ma F P = + . b. Ma F P = °+ sin 30 . c. Ma F P = °+ cos 30 . d. Ma F P Mg = °+ ° sin cos 30 30 . e. Ma F P Mg = °+ ° cos cos 30 30 . 2. The horizontal surface on which the objects slide is frictionless. If M = 2 0 . kg , the tension in string 1 is 12 N. Determine F in N. 1 2 M F M 2 M 2 a. 25 b. 20 c. 30 d. 35 e. 40 3. A 1200 kg car on a flat surface moves in a circle with a 62 m radius. What is the minimum coefficient of friction needed for the car to continue in the circular path at a speed of 15 m/s without slipping? a. 0.15 b. 0.23 c. 0.35 d. 0.37 e. 0.41

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4. A 0.60 kg mass is swung in a vertical circle. It is fastened to a string 0.35 m long.
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## This note was uploaded on 12/12/2011 for the course PHYS 3A taught by Professor Casper during the Fall '07 term at UC Irvine.

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mid2key - Midterm II (Physics 3A) Name_, ID_, Discussion_...

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