A small sphere of mass 1kg and charge 1nC slides down from the top of a smooth surface of a large sphere of radius 1m and charge 1C. At what angle measured from the vertical does the little sphere leave the big sphere?

Aspecimen of oil having an initial volume of 580cm^3 is subjected to a pressure increase of 4.0 mpa, and the volume is found to decrease by 0.40 cm^3. (a) what is the bulk modulus of the material? (b) what is the compressibility of the material?