first one is "a spring with a force constant of 600N/m is used in a scale for weighing fish. what is the mass of a fish that stretches the spring 7.5 cm from its normal length?" answer should be 4.6 kg

next one is "A spring in a pogo stick is compressed 12 cm when a 40 kg boy stands on the stick. what is the force constant for the pogo stick's spring?"
answer should be 3.3 x 10^3 N/m

these are real easy and i can get the ones harder than these but i think i lost the formula that im supposed to use so any help on what formulas to plug these numbers into would be awesome thanks.
OMG I'VE GOT A PHYSICS FINAL THIS WEEK AND IF I FAIL IT I GET A D IN THE CLASS!!!

Sorry; I'd help you but I'm currently on the verge of getting a D in physics
1) Fish are unweighable

2)Nobody rides Pogo Sticks anymore
Quote by Zuka
1) Fish are unweighable

2)Nobody rides Pogo Sticks anymore

haha

Sorry, I can't help. I'm not in physics, and what I know it VERY standard. I don't even know what a N/m is.....
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ok.... it's easy. first you convert everything in newton and meter

than the formula is weigth in newton= spring force constant x stretche or compression of the spring in meter.

example

7.5 cm =0,075 m

weight = 600 n/m x 0,075m
=45 N

45N /9.8 = 4.6 kg

edit : 12 cm = 0,12 m
40kg x 9.8 = 392

392 = force consant x 0,12
392/0.12 = force constant

=3266 or 3.3 x 10^3n/m
Last edited by Douglas_Kouslak at Jan 22, 2007,