Earth's distance from the Sun varies during the year Earth's distance from the Sun varies during the year by _____.

a. by 30%.
b. by 3%.
c. by 10%.
d. not at all.


3%

Physics & Space Science

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How small is the Planck length, the smallest unit of the fabric of space itself.

A.) 10^-20 m. B.) 10^-35 m. C.) 10^-25 m. D.) 10^-18 m. E.) 10^-50 m.

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The event horizon marks the boundary within which the density is roughly the same as that of the atomic nucleus

a. True b. False Indicate whether the statement is true or false

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Wave speed and wave frequency are two terms that are

A) basically the same. B) fundamentally different from each other. C) opposites. D) reciprocals.

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A proton is moving at m/s and experiences a magnetic force of magnitude If the magnetic field makes an angle of 40with respect to the velocity of the proton, what is the field's magnitude?

A.
B.
C.
D.
E.

Physics & Space Science