A 0.057 kg tennis ball and a tennis racket collide. The racket has an initial momentum of -2.80 kg•m/s and a final momentum of -1.97 kg•m/s. The ball has an initial momentum of 0.2565 kg•m/s. If you assume the collision is elastic, what is the final velocity of the ball? A. -4.75 m/s

B. -83.26 m/s

C. -14.11 m/s

D. -0.80 m/s

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

Question 1 (5 pts): what is the maximum distance for which you can you resolve the two individual headlights of an on-coming truck as two separate lights rather than one if the headlights are separated by 2.00 m and your eye has a diameter of 1.00 centimeter? assume a wavelength of 500 nm.