We know an object moving in a circle at constant speed feels a centripetal acceleration inward towards the center of the circle. Two students are arguing about this in the context of Newton's 2nd/1st law. One says that since the speed is constant Newton's 1st law says the net force is zero. The other says that since there is a net acceleration points to the center of the circle the net force must also point in to the center of the circle and be non-zero. Who is right

he kicked it 10 feet straight up into the air? i think this works.

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.

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.