COLLEGE OF SCIENCE PHYS 211-General Physics I: Fall 2017 Test #3B: M: Nov. 20, 2

Question

COLLEGE OF SCIENCE PHYS 211-General Physics I: Fall 2017 Test #3B: M: Nov. 20, 2017 Time Allowed: 45 minutes Important: Show your work No work, no credit. Write answers, in proper units, on indicated lines 1. A3 kg object sitting on top of a 8 m bridge is tipped over. Given that the Iam thanklul that this tost will be over before Thankagiving day OTeK Inc. Name: mechanical energy of the object is conserved and that the mechanical energy(ME) is the sum of the potential energy (PE) and the kinetic energy (KE). determine KE, PE, ME, and velocity at the height of 8 m, 5 m, and 3 m h (m 8 v (m/s 2. A string is able to support a hanging load of 27 kg before breaking. If an object of mass 2.0 kg attached to the string rotates in a circle of radius r = 0.7 m on a frictionless horizontal table (while the other end is fixed), find the maximum speed that the string can withstand be fore breaking 3. An object is subjected to a force F (in Newtons)F which varies with position x (in meters), as shown in the aiagram. Find the work done by the force between x = 7 m and x= 12m. 610 14

Explanation / Answer

2). Tension = centripetal force

(27×9.8) = (2×v2)/(0.7)

V = {(27×9.8×0.7)/2}^(1/2) = 9.62m/sec.

Is the maximum speed at which mass can rotate in a circle.

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