Which of the following statements is an example of a testable hypothesis? a) Iron rust formed under water looks nicer than other types.
b) Why does iron rust so quickly under water?
c) Iron rust forms too quickly under water.
d) Iron rust will form slower in colder water.

Which of the following changes to a pipe would increase the conductance by a factor of 12? 1.quadrupling the length and tripling the radius.2.reducing the length by a factor of and doubling the radius.3.tripling the length and reducing the radius by a factor of .4.reducing the length but a factor of and doubling the radius.

Atrain flies at a speed of 350 miles per hour how far will it travel in 3 hours

(10 pts! ) the major factor which causes seasonal weather changes on the earth is: a. elliptical orbit b. variation in distance from sun c. tilt of the axis d. atmosphere