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FM Stiffness Problem

A metal plate of mass 15 kg is placed on top of a spring. The result is that the spring is compressed by 3 cm.

The stiffness of the spring is _ ???
Original post by asifmahmoud
A metal plate of mass 15 kg is placed on top of a spring. The result is that the spring is compressed by 3 cm.

The stiffness of the spring is _ ???


So, what problem are you having?

Stiffness = Force / displacement

And plug in the numbers.
Well i did using Force/compression = 15*9.8/0.03 that gives me 4900 N/m but the answer is wrong.It's on integral test (H1) so i don't even have the answer 🤔😩
Original post by asifmahmoud
Well i did using Force/compression = 15*9.8/0.03 that gives me 4900 N/m but the answer is wrong.It's on integral test (H1) so i don't even have the answer 🤔😩


Can't see anything wrong 15g/0.03 and then whatever value you use for g.

How do you know it's wrong if you don't have the answer?

Never heard of "integral test (H1)". Do you have a link/photo?
20190315_204912.jpg




Original post by ghostwalker
Can't see anything wrong 15g/0.03 and then whatever value you use for g.

How do you know it's wrong if you don't have the answer?

Never heard of "integral test (H1)". Do you have a link/photo?
Original post by asifmahmoud
20190315_204912.jpg


OK, assuming the value of g=9.8 is the one they expect you to use, then I think there's an error in the question.
Yeah that's the only probable thing i can think of now. Btw Thanks anyway.
Original post by ghostwalker
OK, assuming the value of g=9.8 is the one they expect you to use, then I think there's an error in the question.

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