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Im having trouble with this chapter, So thanks for your patience.

Heres how the first question is stated:

1) A 30.0 kg irregularly shaped rock with a density of 4600 kg/m^3 rests on the bottom of a swimming pool.

What is the normal force of the pool bottom on the rock?

What have I tried?

well the normal force should be equal to the force exerted back onto the rock from the bottom of the pool. Also there should not be any air under the pool so the atm shouldnt mattter.

2) You need to determine the density of a ceramic statue. If you suspend it from a spring scale, the scale reads 28.4 N. If you then lower the statue into a tub of water, so that it is completely submerged, the scale reads 17.0 N.

What is the density?

What have I tried?

Density= m/V. m= 28.4/9.8=2.898 kg.

To find the volume use 17N/9.8=1.735kg according to the water but i think this may be wrong. Anyways, if this was right, take 1.735/v=1000, now i have a V and a M, solve for density of statue. This is wrong I believe so please tell me whats wrong with my thought process.