Need help physics problem?

Posted on 2014-11-19 06:11:00 in Physics by BILLU

1)
It takes 5.65 J of work to stretch a Hooke’s-law spring 11.8 cm from its unstressed length. How much the extra work is required to stretch it an additional 12.7 cm?

2)
A 19 g ball is shot from a spring gun whose
spring has a force constant of 430 N/m. The
spring can be compressed 2 cm.
How high will the ball go if the gun is
aimed vertically? The acceleration of grav-
ity is 9.81 m/s2 . Assume that at the end of
the barrel, the spring’s displacement and the
ball’s height are each zero.

3)
A spring with spring constant of 30 N/m is
stretched 0.16m from its equilibrium position.
How much work must be done to stretch it
an additional 0.12 m?

4)
A spring has a force constant of 1 × 105 N/m.
How far must it be stretched for its poten-
tial energy to be 8 J?

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