A block of mass M is supported by a cord C from a rigid support , and another cord D is attached to the bottom of the block . If D is given a sudden jerk D breaks But if D is pulled steadily , cord C breaks . Why ?

A heavy block of mass m is supported by a cord C attached to the ceiling, and another cord D is attached to the bottom of the block. If a sudden jerk is given to D, then

A block of mass M is suspended by a corf A from the ceiling and another cord B is attached to the bottom of the block as shown in Which string will break if we pull the string B (a) with a sudden jerk, (b) steadily ?

A block of mass m is suspended from a fixed support with the help of a cord. Another identical cord is attached to the bottom of the block. Which of the following statement is/are true?

In the system shown in fig. block of mass M is placed on a smooth horizontal surface. There is a mass less rigid support attached to the block. Block of mass m is placed on the first block and it is connected to the support with a spring of force constant K. There is no friction between the blocks. A bullet of mass m_(0) , moving with speed u hits the block of mass M and gets embedded into it. The collision is instantaneous. Assuming that m always stays over M, calculate the maximum extension in the spring caused during the subsequent motion. K=8960 N//m , u=400 m//s

A dynamometer D is attached to two blocks of masses 6 kg and 4 kg as shown in the figure. The reading of the dynamometer is

A uniform disc of mass M and radius R is mounted on an axle supported in frictionless bearings. A light cord is wrapped around the rim of the disc and a steady downward pull T is exerted on the cord. The angular acceleration of the disc is