Power of a force acting on a block varies with time t as shown in figure. Then, angle between force acting on the block and its velocity is
Circle the odd one : Work done, Force xx Effort, Load xx Load arm, Effort xx Effort arm
Assertion: Power of a magetic force on a charged particle is always zero. Reason: Power of electric force on charged particle cannnot be zero.
STATEMENT-1: When a machine gun fires n bullets per second each with kinetic energy k, power of the gun is P = nk STATEMENT-2: Power P = work done/time. STATEMENT-3: For uniform circular motion the instantaneous power delivered by centripetal force is always zero.
The power of a motor is 200W. If the unit of length is halved, that of mass is doubled and that of time is aiso doubled, then the power of the motor in the new system is
If the unit of length is doubled, unit of time is halved and unit of force is quadrupled, the unit of power would change by the factor
Asseration : Power of a constant force is also constant. Reason : Net constant force will always produce a constant acceleration.
Prove that Moment of couple= Force times couple arm
