Two wires are made of the same material and have the same volume. The first wire has a cross-sectional area A and the second wire has a cross-sectional area 3A. If the length of the first wire is increased by on applying a force F, how much force is needed to stretch the second wire by the same amount?
The bulk modulus of a spherical object is B. If it is subjected to uniform pressure P, the fractional decrease in radius will be: