# 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? [Volume of a sphere of radius r is given by V = 4ðr63/3]

1. 👍
2. 👎
3. 👁
1. Assumeing density is the same.

MassA=density*4/3 PI ra^3
MassB= density*4/3 PI rb^3

divideing the second by the first

8=(rb/ra)^3 It sure looks like the ratio of rb/ra is 2.

check my work.

1. 👍
2. 👎
👤
bobpursley

## Similar Questions

1. ### Physics

Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 2.50 m. Two of the spheres have a mass of 4.40 kg each. The third sphere (mass unknown) is released from rest.

2. ### physics

the negative charge distribution over the surface of two isolated spheres is depicted in the diagram. one of the spheres is made of copper and the other is of rubber. identify the sphere that depicts the charge distribution of

3. ### Physics

Four objects - a hoop, a solid cylinder, a solid sphere, and a thin, spherical shell - each has a mass of 4.59 kg and a radius of 0.252 m. (a) Find the moment of inertia for each object as it rotates about the axes shown in the

4. ### Physics

Coulomb measured the deflection of sphere A when spheres A and B had equal charges and were a distance d apart. He then made the charge on B one-third the charge on A. How far apart would the two spheres then have had to be for A

1. ### Physics

A sphere of mass 500g moving with a velocity of 200 cm s-1collides centrally with another sphere of mass 100 g moving with a velocity of 100 cm s-1towards it. After the collision the two spheres stick together. Find the final

2. ### physics

Two conducting spheres are isolated from their surroundings. The radii of spheres A and B are R and R/2 , respectively. Initially sphere A has charge +Q , and sphere B is neutral. A wire is connected between the sphere. What is

3. ### physics concepts (please check over my work)

A uniform cyclinder made of lead has the same mass and the same length as a uniform solid cylinder made of wood. The rotatonal inertia of the lead cylinder compared to the wooden one is: I thought at first that the rotational

4. ### Calculus

A certain magical substance that is used to make solid magical spheres costs \$800 per cubic foot. The power of a magical sphere depends on its surface area, and a magical sphere can be sold for \$20 per square foot of surface area.

1. ### physic

Two spheres of mass M1 = 810 kg and M2 = 390 kg are placed 4.80 m apart. A particle of mass m = 12.0 kg is now placed midway between the two spheres. (a) What is the net gravitational force on the particle due to the two spheres?

2. ### physics

A solid lead sphere of radius 10 m (about 66 ft across!) has a mass of about 57 million kg. If two of these spheres are floating in deep space with their centers 20 m apart, the gravitational attraction between the spheres is only

3. ### physics

consider three identical metal spheres a b and c. sphere a carries a charge of +5q. sphere b carries a charge of -q. sphere c carries no net charge. spheres a and b are touched together and then separated. sphere c is touched to

4. ### Physics

Three spheres are arranged in the xy plane as in the figure below. The first sphere, of mass m1 = 13.4 kg, is located at the origin; the second sphere, of mass m2 = 4.56 kg is located at (−6.00, 0.00) m; and the third sphere, of