Which of these substances has the greatest index of refraction?
a. water
b. glass
c. quartz
d. diamond

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

Which fact supports the conclusion that there will be fewer farm managers in the future? a) a farmer manager’s duties vary by the type of farm. b) farm technology is replacing some administrative jobs c) farm managers often need experience but not education. d) administrative duties include budgeting and training staff.