A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 1.5 m/s. How much thermal energy due to friction was generated in this process? in Joules
2007-12-03 16:03:47 · 3 answers · asked by joe s 1 in Science & Mathematics ➔ Physics
Difference in PE and KE = frictional losses
(PE = mgh ); - (KE= 0.5mv^2)
= 17(9.8) (3.5) - 0.5(17)(1.5*1.5)
= 583.1 J - 19.125 J
frictional losses = 583.1 - 19.125 = 564 J
2007-12-03 16:22:16 · answer #1 · answered by jamesyoy02 6 · 0⤊ 0⤋
Energy at the top of the slide: mgh
Energy at the bottom: 1/2 m v^2
The difference is the energy lost to friction, in Joules.
2007-12-03 16:14:31 · answer #2 · answered by jgoulden 7 · 0⤊ 0⤋
lots of human beings recognize approximately conservation of potential, momentum etc. yet there are additionally a load of alternative conservation regulations, consisting of... Conservation of angular momentum Conservation of center of Mass Conservation of electric powered fee Conservation of coloration fee Conservation of probability Conservation of mass (at low speeds) Conservation of baryon variety Conservation of lepton variety Conservation of style Conservation of parity i've got not got time to describe all of them however the wikipedia hyperlink has extra info. One regulation that may not secure is the "regulation of conservation of money"! I recommend, that's all obtainable, I do exactly no longer look to have lots of it!
2016-10-10 05:03:12 · answer #3 · answered by ? 3 · 0⤊ 0⤋