An airplane flies due north at 172 km/h with respect to the air. There is a wind blowing at 56 km/h to the east relative to the ground. What is the plane's speed relative to the ground?

If a balloon is taken outside on a very cold day, what will occur?

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples

Which composition of water moves to begin a deepwater current?