An initial force F1 is applied to a ball. The ball then rolls away along the floor west to east. A frictional force, f, opposes the motion of the ball. What is the magnitude and direction of the additional force that should be applied to the ball to keep it moving at the same velocity? the magnitude is F=sqrt(F1^2+h^2)
Now choose from one of the following options Why?
a. f in the direction from west to east
b. f in the direction from east to west
c. F1 - f in the direction from west to east
d. F1 - f in the direction from east to west

A2-kg bowling ball is 2.5 meters off the ground on a post when it falls. just before it reaches the ground, it is traveling 7 m/s. assuming that there is no air resistance, which statement is true?

Most of the volume of an atom is occupied by the

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?