Ms. Perry travels north 5 km, 10 Km west, and then turns and travels 5 Km 20 points south. What is her displacement?
A:10 Km East
B:5 Km West
C:20 Km West
D:20 km East

In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 ∘ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30∘ from horizontal. what is the weight of the rider? express your answer with the appropriate units.

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.

If frequency goes up, what happens to wavelength? does it get shorter or longer?