Practice GIKI Physics questions with answers and explanations.
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Torque is rF sinθ.
τ=2×20×sin30° = 20 N·m.
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Angular velocity is angular displacement divided by time.
ω=10/2 = 5 rad/s.
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Angular acceleration is change in angular velocity over time.
α=(16-4)/3 = 4 rad/s².
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Linear speed is v=rω.
V=0.5×8 = 4 m/s.
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Rotational dynamics gives τ=Iα.
τ=3×4 = 12 N·m.
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Opposing torques subtract.
The net magnitude is 15-9 = 6 N·m.
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Net work equals the change in kinetic energy.
Kf=20+80 = 100 J.
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Use W=Fd cosθ.
W=10×4×cos60° = 20 J.
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Kinetic energy is ½mv².
K=½×4×9 = 18 J.
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K=½mv².
K=½×2×100 = 100 J.
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Potential energy change is mgh.
5×10×8 = 400 J.
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Power is work divided by time.
P=600/3 = 200 W.
