Identical spheres are dropped from a height of 100 m 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?

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

What is the gravitational attraction between a dating couple whose centers of mass are 0.630 m apart if the boy weighs 715 n and the girl weighs 465 n?

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill