The figure shows a ‘snapshot’ of four different waves in identical ropes stretched with the same force



The wave where the speed is greatest is



a.

I.



b.

II.



c.

III.



d.

IV.



e.

all of the above.


e

Physics & Space Science

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Earth possesses few visible craters and the moon possesses many. This is because

a. Earth formed later than the moon and, therefore hasn't encountered as many meteoroids. b. the moon doesn't have an atmosphere that could burn up many of the meteorites before impacting. c. erosion and plate tectonics have slowly removed evidence of past cratering on Earth. d. all of the above e. only b and c

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Which can be seen by the naked eye?

a. mv = +10 b. mv = +18 c. mv = +6 d. mv = +8

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If the escape speed of a star is equal to the speed of light, its radius is the so-called Schwarzschild radius. What is the Schwarzschild radius of the sun, whose mass is

A. 4.5 km B. 1.5 km C. 5.9 km D. 3.0 km

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We never find isolated, individual quarks because

A) quarks immediately undergo radioactive decay when they are separated. B) quarks are bound tightly together by neutrinos. C) quarks are always attached to electrons. D) the force between quarks is infinitely strong so they cannot be budged. E) whenever quarks are separated, the energy created by the separation creates new quark pairs.

Physics & Space Science