Which of the following is a necessary trait of a good hypothesis?
A.
It includes a reference to the theory from which the hypothesis was derived.
B.
It is clear and testable.
C.
It is written in the form of a question.
D.
It includes a statement about the type of research to be used in testing the hypothesis.

8. why do radio telescopes convert radio waves (analog signals) to electrical (digital) signals for analysis? (hint: what did the article say about the advantages of digital signals? )

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

1. a net force of 100 newton’s is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of