A 89-kg fullback is running at 3.5 m/s to the east and is stopped in 0.85 s by a head-on tackle by a tackler running due west. Required:
a. Calculate the original momentum of the fullback.
b. The impulse exerted on the fullback.
c. The impulse exerted on the tackler
d. The average force exerted on the tackler.

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

The two metal spheres in the figure are connected by a metal wire with w switch in the middle. initially the switch is open. sphere 1, with the larger radius, i'd given a positive charge. sphere 2, with the smaller radius, is neutral. then the switch is closed. afterward, sphere 1 has charge q1, is at potential v1 and the electric field strength at its surface is e1. the values for sphere 2 are q2, v2, and e2. a. is v1 < ,> , or = to v2? explain. b. is q2 < , > , or = explain? c. is e1 < ,> ,or = to e2? explain?

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? a.positive force, balanced force, negative force b.negative force, balanced force, positive force c.positive force, unbalanced force, negative force d. negative force, unbalanced force, positive force