Posted by **Nicole** on Sunday, November 28, 2010 at 6:06pm.

When a 55 N stone is attached to a spring

scale and is submerged in water, the spring scale reads 30 N.

What is the density of the stone?

Answer in units of kg/m3.

- Physics -
**bobpursley**, Sunday, November 28, 2010 at 6:40pm
apparent weight= 55N-densitywater*g*volumestone

30=55-densitywater*g*volumestone

solve for volume stone

volumestone= 25/(densitywater*g)

density of STone= massstone/volume

= (55/g)/(25/densitywater*g)=55/25 *densitywater

- Physics -
**duss**, Saturday, January 28, 2012 at 7:58am
A book is placed on a horizontal wooden plane that is undergoing simple

harmonic motion with an amplitude of 1.0 m. The coefficient of friction

between the book and the horizontal wooden plane is given by = 0.5.

Determine the frequency of the horizontal wooden platform when the book

is about to slip from the horizontal wooden plane.

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