Which of the following best describes a plane?
a. a curve in a road
b. the edge of a desk
c. the surface of a flat table
d. the point of intersection of two walls

If a clock aboard a space ship traveling at 0.900 c of the speed of light relative to earth chimes once at the beginning of the hour and again when it reads one hour later, how much time would an observer on earth say elapsed between the two chimes?

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat