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15. A pulley fixed to the ceilling carries a string with blocks of mass m and 3 m attached to its ends. The masses of string and pulley are negligible. When the system is released, its centre of mass moves with what acceleration

(a)  0                                         (b) g/4

(c)   g/2                                  (d) -g/2

Ans. b

(9)

5/5 - (4 votes)

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12. An ideal gas is taken through the cycle A→ B → C → A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C → A is
05/09/2022

(a)      – 5 J (b)  – 10 J (c)   – 15 J (d)  – 20 J Answer-a (118)

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