What happens when the temperature of a substance decreases significantly?
a.
most substances will expand.
b.
most substances will gain atoms.
c.
most substances will disappear.
d.
most substances will contract.

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.

When does your body conduct current more readily?

What is a good example of instantaneous speed