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A non uniform beam of weight 120 N pivoted at one end is shown in the diagram below. Calculate the value of F to keep the beam in equilibrium.
Assertion: Torque is an axial vector. Reason: Force is a polar vector.
Assertion (A): Work done by a force is zero when the force acts perpendicular to the displacement. Reason (R): Work is calculated as the product of force and displacement in the direction of the force.
Assertion: A person lifting a heavy object does more work when lifting it quickly compared to slowly. Reason: Work done is dependent on the speed at which the lifting occurs.
Power is defined as the rate of doing work. A cyclist is moving along a flat road. He has a mass of 70 kg and is pedaling to maintain a constant speed of 5 m/s. The cyclist experiences a frictional force of 20 N acting opposite to the direction of motion.
A: Torque on a body can be zero even if there is a net force on it. R: Torque and force on a body are always perpendicular.
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