Physics 1401 Test 3 Name Instructions: Show all your work and make sure I can fi

Question

Physics 1401 Test 3 Name Instructions: Show all your work and make sure I can find your answers. Best o Multiple Choice (Show all work for partial credit);: 1. A certain wheel has a rotational inertia of 12 kg m2. As it turns through f luck. 5.0 rev its angular velocity increases from 5.0 rad/s to 6.0 rad/s. If the net torque is constant its value is: a.) 0.016 N m b.) 0.18 N m c.) 0.57 N m d.) 2.1 N m e.) 3.6 N m 2. An 80-kg man balances the boy on a teeter-totter as shown The mass of the board 5 kg What is the approximate mass of the boy? a.) 10 kg 20 ka

Explanation / Answer

Given , wi = 5 rad/s , wf = 6 rad/s , I = 12 kgm^2

= 5 rev = (5*6.283) radians = 31.42 radians

So, angular acceleration

= wf^2 - wi^2 /2*

= 36 - 25/2*31.42 = 0.175 rad/s^2

Torque = I* = 12*.175 = 2.1 Nm

Therefore , answer) option d)2.1 Nm

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