AIPMT 2008 | Work, Energy and Power Question 44 | Physics

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine ? (g = 10 m/s²)

12.3 kW

7.0 kW

8.1 kW

10.2 kW

AIPMT 2007

MCQ (Single Correct Answer)

-1

A vertical spring with force constant k is fixed on a table. A ball of mass m at a height h above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance d. The net work done in the process is

mg(h + d) $$-$$ $${1 \over 2}$$kd²

mg(h $$-$$ d) $$-$$ $${1 \over 2}$$kd²

mg(h $$-$$ d) + $${1 \over 2}$$kd²

mg(h + d) + $${1 \over 2}$$kd²

AIPMT 2006

MCQ (Single Correct Answer)

-1

A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation s = $${1 \over 3}$$t², where t is in seconds. Work done by the force in 2 seconds is

$${{19} \over 5}J$$

$${5 \over {19}}J$$

$${3 \over {8}}J$$

$${8 \over {3}}J$$

AIPMT 2006

MCQ (Single Correct Answer)

-1

The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it is

U/4

16U

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