Can please solve the second a question the elapsed time the angular acceleration

Question

Can please solve the second a question

the elapsed time the angular acceleration of the blades the linear velocity of the blade tips A rowing machine consits of a flywheel with a diameter of 80-cm An athlete applies a tangential force of 10-N to the rim and the flywheel takes 1.5 s to complete one revolution. If the flywheel starts from rest; Determine; the applied torque the angular acceleration of the flywheel the wheel moment of inertia the wheel's kinetic energy when it reaches its first revolution the average power applied to the wheel

Explanation / Answer

a) applied Torque = F*r = 10*0.4 = 4Nm, Torque = I*alpha, and s = alpha*t^2, so alpha = s/t^2= 2pi/1.5^2 = 2.7925,

b)so alpha = 2.7925,

c)I = torque/alpha = 4/2.7925 = 1.4324kgm^2,

d) energy = 1/2 Iw^2 = 1/2*4*w^2, also w^2 = 2*alpha*s = 2*2.7925*2pi = 35, so energy = 70.18J,

e)Power = work/time = 70.18J/1.5 = 46.78watt

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