Problem 1: A football is kicked 51.4 meters. The ball is in the air 4.16 s before it lands. Use g = 9.81 m/s2 for your calculations a) Find the magnitude of the velocity.

b) Find the angle of its initial velocity in degrees above horizontal.

Answer quickly (15 points) a comet is approaching earth. describe earth’s gravitational pull as the comet gets closer to it. a. remain constant b. increase c. decrease d. reversed

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.