1. If a plane flies at 4.5 x 102 km/h against a 3.2 x 102 km/h wind, how long does it take the plane to fly between two stations that are 300 km apart?
2. A person runs from the front to the back of an aircraft at a velocity of 3.0 m/s. IF
the aircraft carrier is moving forward at 20.0 m/s, how fast does the spy appear to
be running when viewed by an observer on a stationary submarine?
3. Suppose a dolphin begins to chase a fish at 37.0 km/h when the fish is 50.0 m
away. The fish swims away at a speed of 15.0 km/h. How long would it take the
dolphin to catch the fish?
4, an animal transport moves at 30.0 m/s north along a highway. Inside a dog moves
at 2.00 m/s at an angle of 45° east of north. What is the velocity of the dog relative
to the road?

In the future, people will only enjoy one sport: electrodisc. in this sport, you gain points when you cause metallic discs hovering on a field to exchange charge. you are an electrodisc player playing the popular four disc variant. the disks have charges of qa = −8.0 µc, qb = −2.0 µc, qc = +5.0 µc, and qd = +12.0 µc. (1) you bring two disks together and then separate them. you measure the resulting charge of these two disks and find that it is +5.0 µc per disk. which two disks did you bring together? (a) a and b (b) a and c (c)a and d (d)b and c(e) b and d (f) c and d. (2) you bring three disks together and then separate them. you measure the resulting charge of these three disks and find that it is +3.0 µc per disk. which three disks did you bring together? a, b, and c (a) a, b, and d (c) a, c, and d (d) b, c, and d. (3) given the resulting charge of each disk measured in (b) is +3.0 µc, how many electrons would you need to add to a disk of this charge to electrically neutralize it? electrons