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A 40 kilogram girl climbs a vertical distance of 5 meters in twenty seconds at a constant velocity. How much work has the girl done?
Ans:
2000 joules or 1960 joules work is done by the girl.
What is the luminous flux of a flashlight that provides an luminance of 145 lx to the surface of water when held 0.50 m above the water?
The device which changes chemical energy into electrical energy is called as electric cell. Battery is a host of constant emf but not constant current.
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the factors which decide the broad area of scientific activity ?
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