identical spheres are dropped from a height of 100m above the surfaces of both planet x and planet y. the position of the spheres as a function of time is recorded as the spheres fall. these data are shown in the graphs above. which planet exerts a greater gravitational force on the sphere, and what evidence supports this conclusion?

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.

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.