# Physics : 20190311060900final Answers Hw 2

SOLUTION:W = Fd = (600 N)(100 m) = 60000 JSOLUTION:PE0 = 0 JPEf = mgh = (300 kg)(9.81 m/s2)(2.20 m) = 6474.6 JPE = 6474.6 J 0 J = 6474.6 JW = PE = 6474.6 JPower = W/t = 6474.6 J / 5sPower = 1295 WSOLUTION:Because the electric company is the one that converts potential energy (from the sun) to electricalenergy which is not an easy process.SOLUTION:KE = mv2 = (1 kg)(8 m/s)2 = 32 JSOLUTION:B. The same amount of workSOLUTION:A. The higher that an object is, the more potential energy which it will haveSOLUTION:A box of shingles is sitting on the roof gravitational potential energyA box of shingles is dropped from the roof and is falling to the ground below both forms of energyAs soon as the light turned green, the driver stepped on the gas and the car accelerated down the levelhighway kinetic energySOLUTION:Both of them will have the same speed because the relative heights of the starting and end points arethe same at 5 mSOLUTION:Both balls will have the same speed when they hit the ground. This is because the initial reference pointis the same for both and total mechanical energy will always be conserved.SOLUTION:Work for both are the same.SOLUTION:First, we need to compute for the angle that the incline makes with the horizontal as follows:sin angle = 6 / 10angle = sin-1 (0.6) = 36.870The force along the incline is as follows:Fincline = mgsin(angle) = (15 kg)(9.81 m/s2)(0.6)Fincline = 88.29 N (pushing f ...

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