A positive charge and a negative charge held near each other are released. As they move, the force on each particle
a. increases.
b. Stays the same.
c. decreases.
Ans: a. increases.
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Which two bodies show evidence of heavy cratering?
a. Mercury and Venus b. Mercury and Earth c. Mercury and Earth’s Moon d. Earth and Venus e. Earth and Mars
Suppose that hydrogen, rather than iron, had the lowest mass per nuclear particle. Which of the following would be true?
A) Stars would be brighter. B) Stars would be less massive. C) All stars would be red giants. D) Nuclear fusion could not power stars.
A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to a maximum height of 35 m above ground level. What is the change in mechanical energy of the mass caused by air resistance between the point of projection and the point of maximum height?
A. ?0.21 kJ B. ?0.47 kJ C. ?0.40 kJ D. ?0.34 kJ E. ?0.69 kJ
Briefly describe the two main lines of evidence for the modern theory of the moon's formation, wherein the Earth was hit by an approximately Mars-sized object
What will be an ideal response?