#1 Energy and Power A 545 Newton force is used to push a couch at a constant spe

Question

#1 Energy and Power A 545 Newton force is used to push a couch at a constant speed of 1.32 m/s where the force pushing the couch is in the direction of the velocity. What power is developed? O A. 719 w B.978 W C. 1,230 W D. 1,540 w #2 Conservation of Energy A 0.150 kg baseball descends 10.0 meters, where g = 9.8 m/s. By how much does the potential energy of the baseball change? A. 0.00J O B.-10.1 J ° C.-14.73 D.-19.4 J #3 Conservation of Energy In #2, by how m.uch does the kinetic energy of the baseball change? A. 0.00 J B.-10.1J ° C.-14.73 D. +14.73

Explanation / Answer

A). Power = F.V.COS(@) here @ = 0 degree

So P = 545 × 1.32 = 719 watt

B). P.E. = mg(change in height) = 0.15×10×9.8 = -14.7 joule

C). Gain in kinetic energy = loss in potential energy

By energy conservation law

So K.E. = + 14.7 joule.

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