When i drop a bouncy ball it bounces back up to me. what force causes it to bounce?

Space vehicles traveling through earth's radiation belts can intercept a significant number of electrons. the resulting charge buildup can damage electronic components and disrupt operations. suppose a spherical metallic satellite 1.3 m in diameter accumulates 3.0 µc of charge in one orbital revolution. (a) find the resulting surface charge density. (b) calculate the magnitude of the electric field just outside the surface of the satellite, due to the surface charge.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

Which branches of natural science include the study of an organism that lived 10 million years ago