A car starts from rest and after 10 seconds is traveling at 30 m/s. Assuming that it continues to accelerate at the same rate it will take another ________ seconds to reach 60 m/s.

Fill in the blank(s) with the appropriate word(s).


10
ten
10.0

Physics & Space Science

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A sodium light (? = 589.3 nm) is used to view a soap film to make it look black when directed perpendicular to the film. What is the minimum thickness of the soap film if the index of refraction of soap solution is 1.38?

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As measured from the Earth, a spacecraft is moving at speed 0.80c toward another spacecraft moving at speed 0.60c in the same direction, i.e., the first spacecraft is catching up with the second spacecraft. What is the speed of the first spacecraft as viewed from the second spacecraft?

a. 0.38c b. –0.20c c. –0.38c d. not given

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Assure competent workforce

What will be an ideal response?

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