A 300 N child is in a swing that is attached to a pair of ropes 2.00 m long. Find the gravitational potential energy of the child–Earth system relative to the child's lowest position at the following times.   (a) when the ropes are horizontal   (b) when the ropes make a 30.0° angle with the vertical   (c) when the child is at the bottom of the circular arc

A 450-N child is in a swing that is attached to a pair of ropes 1.90 m long. Find the gravitational potential energy of the child- Earth system relative to the child's lowest position at the following times. (a) when the ropes are horizontal J (b) when the ropes make a 29.0° angle with the vertical J (c) when the child is at the bottom of the circular arc J

You drop a 2.60 kg book to a friend who stands on the ground at distance D = 12.0 m below. If your friend's outstretched hands are at distance d = 1.50 m above the ground (see the figure), (a) how much work Wg does the gravitational force do on the book as it drops to her hands? (b) What is the change AU in the gravitational potential energy of the book-Earth system during the drop? If the gravitational potential energy U of that system is taken to be zero at ground level, what is U (c) when the book is released and (d) when it reaches her hands? Now take U to be 100 J at ground level and again find (e) Wg, (f) AU, (g) U at the release point, and (h) U at her hands. (a) Number i Units (b) Number i Units (c) Number i Units (d) Number i Units (e) Number i Units (f) Number i Units (g) Number i Units (h) Number i Units > > > > > > >

A woman places a 2 kg block against a horizontal spring of force constant K = 300 N/m and compresses it 9 cm. a) Find the work done by the woman and the work done by the spring.b) The block is released and leaves the spring when the spring is at its original position. Find the speed of the block when it leaves the spring.