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Q.

The motor connected to A (not shown) is pulling up the 200 kg block along the rough incline with constant speed of 5 m/s when power output of motor is 10 kW. If the power out put of motor is suddenly increased to 15 kW then the acceleration of block just after increasing the power is.

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a

5 m/s2

b

1 m/s2

c

Zero

d

can’t be computed from the given information.

answer is A.

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Detailed Solution

When the block is moving with constant velocity v then T=μN+200g sin 370TV = 10 \times {10^3} & & \mu N = 800NWhen P1=15kW, then T1=15×1035=3000NT1- μN-200gsin370=200a⇒a=5m/s2

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The motor connected to A (not shown) is pulling up the 200 kg block along the rough incline with constant speed of 5 m/s when power output of motor is 10 kW. If the power out put of motor is suddenly increased to 15 kW then the acceleration of block just after increasing the power is.