A tennis racket hits a tennis ball. The racket has a mass that is four times greater than the tennis ball. Compared to the force exerted on the ball by the racket, the force exerted on the racket by the ball is A.) four times smaller
B.) the same
C.) 16 times smaller
D.) four times greater

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

Which type of bond is found between the atoms of a molecule? a. metallic b. delocalized electron c. covalent d. ionic

When using the scientist method, which step comes last?