Air is a mixture of what?
1. Elements
2. Atoms
3. Compounds
4. Molecules

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

Estimate of the number of stars in our galaxy

Pressure is a measure of force per unit area or p=f/ap=f/a. a student is checking the amount of pressure their car exerts upon the road. the car weighs 22 tons ( us short ton ). the student finds the dimensions of each tire's footprint on the road is 12.5 cm x 16.5 cm. in pounds per square inch (psi), what is the total pressure the car exerts upon the road?