A block moves in uniform circular motion because a cord tied to the block is anchored at the center of a circle. Is the power of the force exerted on the block by the cord positive, negative, or zero?

A block moves with uniform circular motion because a cord tied to the block is anchored at the centre of a circle. Is the power of the force exerted on the block by the cord positive, negative or zero?

A block of mass m is revolving in a circle on a smooth table. The speed of the block is continuously reducing. The power delivered to the block : A. is zero B. has a positive value C. has a negative value D. information is insufficient to conclude anything

Two 100 g blocks hang at the ends of a light flexible cord passing over a small frictionless pulley. A 40 g block rests on the block an right and removed after 2 sec. (a) How far will each block move in the first second after the 40 g block is removed? (b) What was the tension in the cord before the 40 g block was removed? (c) What was the tension in the cord supporting the pulley after the 40 g block was removed?

Consider a block moving in a horizontal circular path on the inner surface of a cone. The normal force on the block is :

Consider a block moving in a horizontal circular path on the inner surface of a cone. The normal force on the block is :

A block weighing 20N rests on a horizontal surface . The coefficient of static friction between the block and surface is 0.4 and the coeffiecient of kinetic frictioni 0.20 a.How much is the friction force excerted on the block? b. How much will the friction force be if a horizontal force of 5 N is exerted on the block? c. What is the minimum force that will start the block in motion ? d. What is the minimum force that will keep the block in motion once is has been started ? e. If the horizontal force is 10 N what is the friction force?

A block of mass 'm' is placed on the floor of a lift, moving upward with an uniform acceleration a = g. ( mu is the coefficient of friction between block and the floor of lift). If a horizontal force of umg acts on the block, then horizontal acceleration of the body is .......

A block of mass 'm' is placed on the floor of a lift, moving upward with an uniform acceleration a = g. ( mu is the coefficient of friction between block and the floor of lift). If a horizontal force of umg acts on the block, then horizontal acceleration of the body is .......