A water molecule is made up of one oxygen and two hydrogen atoms. Why is water considered a pure substance?

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.

How do you tell if someone actually cares about you? and just say they do?

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving