Case (a) in the following figure shows block A accelerated across a frictionless

Question

Case (a) in the following figure shows block A accelerated across a frictionless table by a hanging 10 N block (i.e. of mass 1.02 kg). In case (b), the same block A is accelerated by a steady 10 N tension in the string. Neglecting the mass of the string, the acceleration of block A in case (b) is a. equal to that in case (a) b. greater than that in case (a) c. less than that in case (a) d. can either be greater or less than that in (a) depending on whether the mass of A is greater or less than 1.02 kg Three boxes are lined up touching each other on a smooth table as shown. The masses are in the ratio of 1: 2: 3 and a force F is pushing the system to the right. If the force acting between the two lighter blocks is F_1 and that between the other two blocks is F_2 which of the following statements is correct? a. F_1 = F_2 b. F_1 F_2 d. both b. and c. are possible depending on the value of F

Explanation / Answer

here,

14)

the accelration , a = net force /effective mass

so, for a

the accelration , a1 = T /( mA + mB)

and for b

the accelration , a2 = T/( mA )

so, a2 > a1

correct option is b) greater than that in case (a)

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