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*1. A thin spherical shell with a mass of 3.82 kg and a diameter of 0.200 m is filled with helium (density = 0.180 kg/m3). It is then released from rest on the bottom of a pool of water that is 3.73 m deep. Neglecting frictional effects, determine the value of that acceleration.*

Can anyone help me with this question? I found the volume of the sphere v = m/density, and the area of the sphere, but got stuck on how to actually find the acceleration, would you have to use Force=Pressure/Area somewhere?

2.

*A U-tube of circular diameter 5.60 mm initally contain just water. If 4.00 milliliters(cm^3) of oil is added to the left hand side of the tube the level of the oil is 6.8 mm higher than the level of the water in the right hand side of the tube. Determine the height of the oil.*

Im confused on what they mean by the circular diameter and do you need that to solve the question. I tried using the formula for volume of a cylinder, solving for height, but I don't think that helped at all. Can anyone give me some pointers?

Theres no examples like this in my notes, or in my text, and the assingment is due in 2 hours. Thanks