Quick Physics Questions! Please help!?

Posted on 2014-11-19 05:51:00 in Physics by PHYSICS ONLINE HELP

1)
A 7.2 kg block is dropped onto a spring of
spring constant 2357 N/m from a height of
700 cm.
Find the speed of the block when the com-
pression of the spring is 20 cm. The acceleration of gravity is 9.81 m/s2 .
Answer in units of m/s
Dont forget to convert to SI units!

2a)
The Royal Gorge bridge over the Arkansas
River is 366 m above the river. A bungee
jumper of mass 108 kg has an elastic cord of length 92 m attached to her feet. Assume the cord acts like a spring of force constant k. The jumper leaps, barely touches the water, and after numerous ups and downs comes to rest
at a height h above the water.
The acceleration of gravity is 9.81 m/s2 .
Find h.
Answer in units of m

2b)
Find the maximum speed of the jumper.
Answer in units of m/s

3)
A child whose weight is 320 N swings out
over a pool of water using a rope attached
to the branch of a tree at the edge of the
pool. The branch is 10.6 m above ground
level and the surface of the water is 1.55 m below ground level. The child holds on to a rope of length 6.4 m attached to the branch and moves back until the angle between the rope and the vertical is 68. When the rope is in the vertical position, the child lets go and drops into the pool.
The acceleration due to gravity is
9.81 m/s2.
Find the speed of the child at the surface of the water. Answer in units of m/s

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