A line representing a wave front for a wave should be drawn:

a. from the source to the receiver.
b. from one crest to the preceding crest.
c. in the direction the wave is moving.
d. along one of the crests of the wave.


D

Physics & Space Science

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A toy rocket, weighing 10. N, blasts off from ground level. At the exact top of its trajectory, its energy is 140. J. To what vertical height does it rise?

A) 1.4 m B) 14. m C) 12. m D) 0.12 km E) 1.4 km

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Why are astronauts weightless in the Space Station?

A) because the Space Station is traveling so fast B) because the Space Station is constantly in free-fall around the Earth C) because there is no gravity in space D) because the Space Station is moving at constant velocity

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When cottonseed oil (a liquid) is hydrogenated, the solid fat called ______________ is obtained

Fill in the blank(s) with correct word

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The intensity of a sound wave is directly proportional to

A. the frequency. B. the amplitude. C. the square of the amplitude. D. the square of the speed of sound. E. none of these answers are correct

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