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I have a quick question:
10. When a 500-g mass is suspended from a spring, it stretches 2.5 cm.
What is the force constant of the spring? If you now pull the mass
down producing a further displacement of 5 cm, what is the work
done on the spring?
The answer for the second part the professor has:
W=.5kx^2 = .245J
How come we don't use the equation:
W=.5k(xf^2-xi^2) doesn't the spring already have a load on it that stretches it?
I got .49J
10. When a 500-g mass is suspended from a spring, it stretches 2.5 cm.
What is the force constant of the spring? If you now pull the mass
down producing a further displacement of 5 cm, what is the work
done on the spring?
The answer for the second part the professor has:
W=.5kx^2 = .245J
How come we don't use the equation:
W=.5k(xf^2-xi^2) doesn't the spring already have a load on it that stretches it?
I got .49J