A 30 kg child slides down a playground slide from a height of 1.5 m above the bottom of the slide. If the child's speed at the bottom is 3.1 m/s , what is the work done by the nonconservative forces?
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2007-09-30 03:33:14 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
At top the potential energy is
30*9.8 *1.5 =441 joule
At ground ther is only kinetic energy = 1/2*30*3.1^2 =144.15 joule
The difference is the work of nonconservatives forces=296.85 joules
2007-09-30 03:43:32 · answer #1 · answered by santmann2002 7 · 0⤊ 0⤋
the galaxies rotate at speeds inconsistent with their obvious mass is seeing that we do see it all. I am regarding it as being the theoretical Dark Matter. There are very powerful proofs that shows that darkish subject exist. One the is the inconsistent pace of and obvious mass. darkish subject makes up approximately seventy five% to eighty% of the problem within the Universe...
2016-09-05 12:15:30 · answer #2 · answered by kryst 4 · 0⤊ 0⤋