Two tiny grains of sand having charges of 4.0 ?C and -4.0 ?C are situated along the x-axis at x1 = 2.0 m and x2 = -2.0 m
What is electric potential energy of the system of these grains assuming that at infinity the energy of the system is zero? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) -36 mJ
B) 36 mJ
C) 0 J
D) -72 mJ
E) 72 mJ
A
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The first solid grains of ______ formed in hot regions near the sun. Much farther from the sun the first grains (or rather flakes) of ________also formed by a similar process as the close-in grains, _______
a. water ice; iron; accretion b. iron: water ice; accretion c. water ice; iron; condensation d. iron; water ice; condensation
_________________ refers to the ability of a telescope to produce bright images
Fill in the blank(s) with correct word
) A 100-W lamp glows brighter than a 25-W lamp. The electrical resistance of the 100-W lamp is
A) less. B) greater. C) the same.
We are unlikely to find fossil evidence of life from more than 3.5 billion years ago because there is no way life existed before then
Indicate whether the statement is true or false