PAST PAPER EXAM QUESTIONS Flashcards
1
Q
a student hanged a weight of a newtonmeter
the energy now stored in the spring in the newtonmeter is 4.5 x 10^-2 J
the student then increases the weight on the newtonmeter by 2N
calculate the total extenion of the spring
spring costant = 400n/m
use the formula :
elastic potential energy x 0.5 x spring constant x ( extenion)^2
A
4.5x10^-2 = o.5 x 400 x extenion ^2
( rearrange)
e^2 = 4.5x10^-2 / 400 x 0.5
e^2 = 0.45/200
e^2 = 2.25x10^-4
e = root 2.25 x 10^-4
e = 0.015
f = k x e
force = 8
8 = 400 x 0.015
8 divided 400 = e
e = 0.02
