Homework Statement
A 70kg diver jumps from a 12 m tower, with no initial velocity.
a)With what velocity does the diver hit the water
b)What would his impact velocity be if, in jumping from the tower, he gave himself a upward initial velocity of 5.0 m/s ?
Homework Equations
W=FaDcos of...
Homework Statement
A force of 5.00 N compresses a spring 5.00 cm. What is the elastic potential energy stored in the compressed spring?
Homework Equations
Ep=1/2kx2
The Attempt at a Solution
Epelastic needs to calculated. I really do not know how to get there. K=f/x
k=5N/ 0.05m...
Homework Statement
A 2.20 kg object vibrates at the end of a horizontal spring whose force constant is 320 N/m. What is its period of vibration?
Homework Equations
Ep=1/2kx2
The Attempt at a Solution
I don't even know where to start
Homework Statement
A 10.0 kg box is slid down15.0 m along a 20.0o ramp. The force of friction is 40.0 N. What is the change in the gravitational potential energy of the box?
Homework Equations
W=Fdcos of theta
The Attempt at a Solution
W=(40 N)(15 m)(cos 20)
=563.8J
The actual...
Homework Statement
It is estimated that 3.0 x 1010 kg of water flow over Niagara falls each hour. The height of the fall is 65 m. What is the total gravitational potential energy of the water relative to the bottom of the falls that falls in one hour. What is the power represented by the...
Homework Statement
A 0.50 kg ball accelerated from rest by a 8.0 N force for 3.0 m
Homework Equations
W=E
Ek= 1/2mv2
Ep=mgh
The Attempt at a Solution
Given: mass= 0.50 Kg, V=0m/s, F=8.0 N, d=3.0 m
Ek=1/2mv2
=1/2(0.50 kg)(0 m/s)2
=o J
That's wrong