Erase your memory.
weight=kx
mass*9.8=111*.340
mass= you do it.
and finally, you have reversed digits twice above. distance was .340, no .430
A spring with a force constant of 111 Nm is attached to the ceiling. When an unknown mass is attached it pulls the spring down 0.340m to its equilibrium position. The mass is then pulled 9cm below its equilibrium position and oscillates back and forth. Determine the mass in kg.
I am using -kx = ma.
I consider x to be 0.43m (0.340 + 0.09). I get (-111)(.43) = 9.8m, giving me:
m = -4.87.
First, mass can't be negative! Second, when I just entered 4.87, my answer was wrong.
Why? What should I do?
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