A pulsar requires that a neutron star I. rotate rapidly. II. have a radius of at least 10 km. III. have a strong magnetic field. IV. rotate on an axis that is different from the axis of the magnetic field

a. I & III
b. I & IV
c. II, III, & IV
d. I, III, & IV
e. I, II, III, & IV


D

Physics & Space Science

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The stars found in nebulae like the Orion Nebula probably formed:

A) a few million years ago. B) about 10 million years ago. C) hundreds of millions of years ago. D) billions of years ago. E) at the beginning of the universe.

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Indicate whether the statement is true or false

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An outcome of universal gravitation is that

A) planets aren't cubes with sharp corners. B) its discovery prompted other laws of nature. C) it provided prediction and discovery of planets. D) all of the above

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How many times greater is the speed of red light (? = 700 nm) than the speed of violet light (? = 400 nm) in a vacuum?

a. 1.75 , the first color of light is faster b. 0.57 , the second color of light is faster c. 3.00 × 10^8 , the first color of light is faster d. 1.00 , both colors of light have the same speed e. 3.00 × 10^8 , the second color of light is faster

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