Water falls from a 40 m high dam at the rate of 9 × 10 4 kg per hour. Fifty percentage of gravitational potential energy can be converted into electrical energy. Using this hydro electric energy number of 100 W lamps, that can be lit,

Question

Water falls from a 40 m high dam at the rate of 9 &#215; 10 4 kg per hour. Fifty percentage of gravitational potential energy can be converted into electrical energy. Using this hydro electric energy number of 100 W lamps, that can be lit, is (Take g = 10 ms - 2 )

Quantrex Academy · Accepted Answer

Correct answer: B. 50

Since 50 % efficiency is given, half of the energy of the falling water will be used by the bulbs. Therefore, 1 2 &#8710; m g h &#916; t = n &#215; P &#8658; 1 2 &#215; 9 &#215; 10 4 3600 &#215; 10 &#215; 40 = 100 n &#8658; n = 50

Water falls from a 40 m high dam at the rate of 9 × 10 4 kg per hour. Fifty percentage of gravitational potential energy can be converted into electrical energy. Using this hydro electric energy number of 100 W lamps, that can be lit, is (Take g = 10 ms - 2 )

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Water falls from a 40 m high dam at the rate of 9 &#215; 10 4 kg per hour. Fifty percentage of gravitational potential energy can be converted into electrical energy. Using this hydro electric energy number of 100 W lamps, that can be lit, is (Take g = 10 ms - 2 )

Options

Correct answer

Step-by-step solution

More from Work, Power and Energy

Water falls from a 40 m high dam at the rate of 9 × 10 4 kg per hour. Fifty percentage of gravitational potential energy can be converted into electrical energy. Using this hydro electric energy number of 100 W lamps, that can be lit, is (Take g = 10 ms - 2 )