Q1. A small metal sphere of mass 4.80 g and charge 9.90 μC is fired with an initial speed of 8.00 m/s directly toward the center of the second metal sphere carrying charge 5.20 μC. This second sphere is held fixed. If the spheres are originally a large distance apart, how close do they get to each other? Treat the spheres as point charges
Q2. A major-league catcher gloves a 92 {rm mi}/{rm h} pitch and brings it to rest in 0.15 {rm m}.If the force exerted by the catcher is 803 {rm N}, what is the mass of the ball?
Q3. A 120 kg mail bag hangs by a vertical rope 4.00 m long. A postal worker then displaces the bag to a position 2.10 m sideways from its original position, always keeping the rope taut.