Physics (maybe it's just math)
posted by Brenda .
A sphere of copper is subjected to 89.7 MPa of pressure. The bulk modulus is 130 GPa. a) By what fraction does the volume of the sphere change? b) By what fraction does the radius of the sphere change?
for a) I have dV/V = 0.00069  this is correct.
for b) the area I have 4/3 x pi x r^3.
I did the following:
Try 1  0.00069 = 4/3 x pi x dr^3  wrong
Try 2  then I took the cube root of 0.00069 and got 0.088  wrong.
Try 3  I used the same factor of 0.00069 since the radius is all that is changing in the equation  wrong.
Try 4  I tried factoring dr = rfinal  rinitial and I'm left with something I don't know how to deal with.
HELP! Is it 4 and I need to use some algebra technique I can't remember how to do???
Respond to this Question
Similar Questions

physics
Two solid spheres A and B are made from the same material. The mass of sphere B is eight times that of sphere A. If the radius of sphere A is 7.50 cm, what is the radius of sphere B? 
college physics
Two solid spheres A and B are made from the same material. The mass of sphere B is eight times that of sphere A. If the radius of sphere A is 7.50 cm, what is the radius of sphere B? 
college physics
Two solid spheres A and B are made from the same material. The mass of sphere B is eight times that of sphere A. If the radius of sphere A is 7.50 cm, what is the radius of sphere B? 
Physics
A solid sphere of uniform density starts from rest and rolls without slipping a distance of d = 4.4 m down a q = 20° incline. The sphere has a mass M = 4.6 kg and a radius R = 0.28 m. Of the total kinetic energy of the sphere, what … 
science material
. Calculate the following: a. the modulus of elasticity, b. the tensile strength, c. the fraction of the load carried by the fiber, for the following composite material stressed under isostrain conditions. The composite consists of … 
Physics Help
Two compressible solids are formed into spheres of the same size. The bulk modulus of sphere two is twice as large as the bulk modulus of sphere one. You now increase the pressure on both spheres by the same amount. As a result of … 
THEORY OF MACHINE
A piece of material subjected to three mutually perpendicular stresses of 70, 56 and 84 MPa. If E= 200 Gpa, Poissions ratio= 0.28 Determine 1) Principal strains 2) Shear modulus 3) Bulk modulus. 
SOLID MECHANICS
A piece of material subjected to three mutually perpendicular stresses of 70, 56 and 84 MPa. If E= 200 Gpa, Poissions ratio= 0.28 Determine 1) Principal strains 2) Shear modulus 3) Bulk modulus 
Chemistry
A pure copper sphere ha a radius of 0.935in. How many moles of copper does it contain? 
soild
A piece of material subjected to three mutually perpendicular stresses of 70, 56 and 84 MPa. If E= 200 Gpa, Poissions ratio= 0.28 Determine 1) Principal strains 2) Shear modulus 3) Bulk modulus.