Help please on University Physics problem!?

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Bankai

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2 PROBLEMS

The length of a bicycle pedal arm is 0.152 m, and a downward force of 111 N is applied to the pedal by the rider. What is the magnitude of the torque about the pedal arm’s pivot when the arm is at angle 60˚ with the vertical?
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A merry-go-round rotates from rotates from rest with an angular acceleration of 1.5 rad/s2. How long does it take to rotate through (a) the first 2.00 rev and (b) the next 2.00 rev?

Please SHOW work on how to do this problem thankyou!
An iron anchor of density 7870 kg/m3 appears 200 N lighter in water than in air. (a) What is the volume of the anchor? (b) How much does it weigh in air?
 
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