A worker pushes a crate up a ramp Which change to the ramp would be the best way to increase its mechanical
efficiency (ME), and why?
O A. Reduce the length of the ramp so that more work is done in less
time.
O B. Wax the sloped surface of the ramp to decrease the friction
between the crate and the ramp.
O c. Cover the ramp with sandpaper to increase the friction between
the crate and the ramp.
O D. Reduce the height of the ramp so that less output work is done on
the crate.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).