Two spheres are cut from a certain uniform rock. one has radius 4.50 cm. the mass of the other is five times greater. find its radius. a. 22.5 cm. b. 6.36 cm. c. 0.90 cm. d. 7.69 c

D) 7.69 cm

Explanation:

As we know that both the sphere must have same density

So the volume of first sphere

now the mass of this sphere is given as

now we know that mass of other sphere is 5 times more than this

so we will have

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

this could be newton#'s law of cooling. the cooling curve is exponential