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Power of Force...

Power of Force

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A particle of mass M is moving in a circular path of radius 2m. Its speed depends on the distance covered by the particle from the hegining according to the relation c = ks, where k is a positive constant and s is the distance covered. The power of force acting on teh particle when the particle has covered half of the circular path will be :

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

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A : Power of the gravitational force on the body in a projectile motion is zero, once during its motion. R : Power delivered by the tension in the wire to a body in vertical circle is always zero.

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Show that power is the product of force and velocity.

When a constant force is applied to a body moving with constant acceleration, is the power, of the force constant ? If not, how would force have to very with speed for the power to be constant ?