Find the ratio of the radii of a baseball to the earth, knowing that the radius of a baseball is .09 m, and that the earth's radius is 6.37 x 10^6 m.

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?

Find an expression for the electric field e⃗ at the center of the semicircle. hint: a small piece of arc length δs spans a small angle δθ=δs /r, where r is the radius. express your answer in terms of the variables q, l, unit vectors i^, j^, and appropriate constants.

A: all waves on the electromagnetic spectrum travel at the same speed in a vacuum. the speed of these waves in a vacuum is 3x108 m/s. as the wavelength of a wave doubles, how does the speed and frequency of the wave change?