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13)
View attachment 27641
22) Volume = mass/density = 3.5 x 10^-25 kg / 9.2 x 10^3 kg m^-3
= 3.36 x 10^-10 m^3
So, answer is C.
Q13--shouldn't the force acting on the box viewed as a horizontal force force to the left? the pulley converts the weight of the mass to that force.
Anyhow I don't get (8-6)x9.81 as 8.0 is the mass in kg's, 6.0 is the frictional force in units N. Can u plz explain it a bit