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Why does a book on a high shelf have more potential energy than on a low shelf?
Well, honey, that book on the high shelf has more potential energy because it's got farther to fall. Gravity's just itching for the chance to show off its power and send that book plummeting down to the ground. So, the higher the book, the more potential energy it's got stored up just waiting to be unleashed.
What is the potential energy of an apple is 6 joules the apple is 3 meters high what is the mass of the apple?
The idea is to use the formula for potential energy: PE = mgh. Replace the numbers you know, and solve for the missing number.
What is the formula for mass x distance?
there is no such things as a mass x distance formula. mass x acceleration = force mass x velocity = momentum mass x gravity x height = gravitational potential energy mass x velocity-squared x 1/2 = kinetic energy mass x distance = don't take physics in high school!
How much power must the legs of a 70-kg man develop in order to run up a staircase 5 m high in 9 seconds?
Work = (force) x (distance) = (mass) x (gravity) x (height) = (70 x 9.8 x 5)Power = work / time = (70 x 9.8 x 5) / (9) = 3811/9 watts = about 0.51 horsepower.Actually, that's the rate at which his gravitational potential energy increasesas his altitude increases, but in order to accomplish it, he has to generateand expend energy significantly faster than that.
How much power does it take to lift 250 N 40 m high in 2 sec?
Energy = Work = (force) x (distance) = (250) x (40) = 10,000 newton-meters = 10,000 joulesPower = energy/time = 10,000 joules/2 seconds = 5,000 watts = about 6.7 horsepower (rounded)
