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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A proton is moving at 
m/s and experiences a magnetic force of magnitude 
If the magnetic field makes an angle of 40
with respect to the velocity of the proton, what is the field's magnitude?
A. 
B. 
C. 
D. 
E. 
Physics & Space Science
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
Physics & Space Science
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.
Physics & Space Science
Wave speed and wave frequency are two terms that are
A) basically the same. B) fundamentally different from each other. C) opposites. D) reciprocals.
Physics & Space Science