Matching a graph to a line equation Which diagram shows the equation v = 2t + 4?

How can Kepler's Third Law be used to estimate the mass of the galaxy?

What will be an ideal response?

Sort the following steps into the correct sequence in which life evolved on Earth.

What will be an ideal response?

A refrigerator has a coefficient of performance equal to 4.2. How much work must be done on the refrigerator in order to remove 250 J of heat from the interior?

A) 60 J B) 120 J C) 250 J D) 480 J E) 1050 J

Doubling the linear size of an object multiplies its area by

1) two, 2) four, 3) six, 4) eight, and its volume and weight by 5) two. 6) four. 7) six. 8) eight.