explain or no rate a mass of 6. 00 kg falls through a height of 50. 0 m and rota
ID: 2123329 • Letter: E
Question
explain or no rate
a mass of 6. 00 kg falls through a height of 50. 0 m and rotates a paddle wheel which stirs 0. 600 kg of water. The water was initially at 14 5% By how much does its temperature rise? (Note: g = 9. 80 N/kg. ) assume that the pulleys at the top of the figure are ideal. 1. 17 degree C 2. 21 degree C 4. 90 degree C 0. 86 degree C 0. 70 degree C 0. 12 degree C G. 7. 0 degree C a projectile is thrown from ground level with a velocity of 19. 6 m/s at an angle of 30 degree from the horizontal. How long does it take before this projectile strikes the ground?Explanation / Answer
Due to conservation of energy the energy produced by falling of block is used up in heating of water.
Energy generated in fall = mass * g * height
=6 *9.8 * 50
=2940 joules
This energy heats up water by T degrees, so
2940 = 600 * 4.18 * T (where 4.18 is the specific heat of water)
T= 1.17 degrees
Hence option A is correct
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