If an object has density ρ0, and radius R0, what happens to the object's surface gravity if the was to shrink to a size with half its initial radius, but the same density? a. 2g0
b. g0
c. g0/2
d. g0/4

The heliocentric and the geocentric models of the solar system included these central principles

Does the distance travelled by an oscillating mass between times t=0 and t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanation.

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.