orestien 25 po A wheel has a radius of o40 m and is mounted on frictionless bear
ID: 2281421 • Letter: O
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orestien 25 po A wheel has a radius of o40 m and is mounted on frictionless bearings. A block is suspended from a rope that is wound on the wheel and attached to it figure). The wheel is released from rest and the block descends IS m in 200 s without any slipping of the rope. The tension in the rope during the doscent of the block is 20 N. What is the moment ofinertia ofthe wheel? A) 3,5 kg m2 B) 37 kg m2 D) 4.1 kg m 4.3 kg m2 Question 25 p) A non uniform, 80.0 g, meter-stick balances when the support is placed at the 51.0-cm mark. At what location on the meterstick should a 5.00 g tack be placed so that the stick will balance at the 50.0 cm mark? A) 19.0 cm B) 67.0 cm C) 66.0 cm D) 35.0 cm Question 12: (.25 po A heavy boy and a lightweight girl are balanced on a massless seesaw, Ifthey both move forward so that they are one-half their original distance from the pivot point, what will happen to the seesaw? Assume that both people are smallenough compared to the length of the seesaw to be thought ofas point masses. A) It is impossible to say without knowing the masses. B) It is impossible to say without knowing the distances. C) The side the boy is sitting on will tilt downward. D) Nothing will happen; the seesaw will still be balanced. E) The side the girl is sitting on will tilt downward.Explanation / Answer
Question 10 answer is E
Your torque force is 20 N, acting over an effort-arm of 0.40 m -- hence, 8 N*m of torque.
It creates a rotation of ? = 1.5 m / 0.40 m = 3.75 radians. This means that its average angular velocity is 1.875 radians per second. It therefore has an angular acceleration from 0 rad/s to 0.4 rad/s.
This happens over 2s, so that the angular acceleration is [3.75 rad/s] / [2s] = 1.87 rad/s
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