Question

Which situation has both the first condition for equilibrium (net force = 0) and the second condition for equilibrium (net torque = 0)?

1) an automobile crankshaft turning at an increasing angular speed in the engine of a parked car

2) an airplane taking off (speed increases)

3) a thrown baseball that rotates as it moves through the air as a projectile (speed changes)

4) none of these

Answer 1

since not angular speed the torque is Zero an aeroplane taling oft { force is not mo] thrown Baseball increases Force hot no S speed changes? Move of these th 4 is corr orrect