For what purpose is the mineral corundum commonly used? A to make drinking glasses
B to make emery boards
C to make pencils
D to make false teeth

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.

What type of nuclear decay causes the atomic number of an element to increase by 1?

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?