|Apr24-10, 03:11 AM||#1|
Calculating Work done by the Earth and the work done by the Spring
1. The problem statement, all variables and given/known data
A mass of 0.091 kg hangs from a vertical spring in the lab room. You pull down on the mass and throw it vertically downward. The speed of the mass just after leaving your hand is 3.80 m/s.
2. Relevant equations
(a) While the mass moves downward a distance of 0.09 m, how much work was done on the mass by the Earth? Include the appropriate sign.
Work done by Earth = ............Joules
(b) At the instant in part (a) when the mass has moved downward a distance of 0.09 m, the speed of the mass has decreased to 2.13 m/s. How much work was done on the mass by the spring? Include the appropriate sign.
Work done by spring = ............Joules
3. The attempt at a solution
To calculate Work I'm using the formula F times displacement
So for (a) I calculated:
0.09m X -9.8m/s/s X 0.091kg = -0.080262J
is that correct?
For part B I have no idea what to do?
Thanks if you can help.
|Apr24-10, 04:11 AM||#2|
Part B mainly requires for you to calculate the difference in the kinetic energy.
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