In the hypothetical atomic interaction shown in figure C9.13, suppose that initially the system’s kinetic energy is 
at an initial separation of 0.1 nm. About how much energy would we have to add to the system for the atoms to fly off to infinite separation?
A. 1 × 10-21 J
B. 6 × 10-21 J
C. 11 × 10-21 J
D. 16 × 10-21 J
E. None. The atoms will do so without adding energy.
C. 11 × 10-21 J
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The element most abundant in the Sun is oxygen
a. True b. False Indicate whether the statement is true or false
In order to determine the mass of a planet by applying Newton's laws of motion and gravity, the planet must have
A) rings. B) moons. C) a solid surface. D) a known size and distance from Earth. E) planets further from the Sun than itself.
A particle (charge = Q) is kept in a fixed position at point P, and a second particle (charge = q) is released from rest when it is a distance R from P. If Q = +2.0 mC, q = ?1.5 mC, and R = 30 cm, what is the kinetic energy of the moving particle after it has moved a distance of 10 cm?
a. 60 kJ b. 45 kJ c. 75 kJ d. 90 kJ e. 230 kJ
The temperature variations of the cosmic microwave background observed by the Planck telescope agree well with our model predictions. This provides persuasive evidence in favor of what?
A) both the Big Bang and inflation B) only the Big Bang, but not inflation C) not the Big Bang, but inflation D) neither the Big Bang nor inflation