Water flows over a waterfall that is 20 m high at the rate of 4.0 × 104 kg/s. If this water powers an electric generator with a 40% efficiency, how many watts of electric power can be supplied?

What will be an ideal response?


3.1 MW

Physics & Space Science

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What is the approximate wavelength of red light?

A. 7 cm B. 5 m C. 400 nm D. 700 nm

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How much energy would be released if 2.0 kg of material was lost during a reaction?

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A navigational beacon in deep space broadcasts at a radio frequency of 50 MHz. A spaceship approaches the beacon with a relative velocity of 0.40c. The spaceship passes the beacon and departs from it with a DIFFERENT relative velocity

The beacon signal is now detected at a frequency of 40 MHz. What is the new velocity of the spaceship relative to the beacon? A) 0.24c B) 0.28c C) 0.26c D) 0.20c E) 0.22c

Physics & Space Science