When using rays to represent the direction of light, these are drawn
A. perpendicular to the wavefronts
B. parallel to the wavefronts
C. so they have no relation to the wavefronts
A. perpendicular to the wavefronts
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When a drag strip vehicle reaches a velocity of 60 m/s, it begins a negative acceleration by releasing a drag chute and applying its brakes. While reducing its velocity back to zero, its acceleration along a straight line path is a constant -6.0 m/s2 . What displacement does it undergo during this deceleration period?
a. 120 m c. 320 m b. 300 m d. 240 m
What is the minimum about of time to achieve significant strength gains in a strength training program?
What force is necessarily applied to the 2.5 cm-diameter piston of a hydraulic lift system in order to lift a truck of mass 1210 kg upon a platform supported by a 15 cm-diameter piston?
A. 33.6 N B. 1980 N C. 330 N D. 494 N E. 4850 N F. 202 N
How did ancient Greeks such as Aristotle know that Earth is round?
A) From the ancient manuscripts of authors such as Homer. B) By noting that ships drop below the horizon as they go out to sea. C) By triangulation (measuring the distance between 2 points, and measuring 2 angles, to determine the distance to a 3rd point). D) Careful measurements of the distance, along Earth's surface, between two widely separated points showed it to be longer than the straight-line distance. E) Actually, the ancient Greeks thought that Earth is flat.