You can increase impulse by increasing
A. force.
B. time.
C. either or both of these
D. none of the above
Answer: C
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An electron de-excites from the fourth quantum level to the third and then directly to the first. Two frequencies of light are emitted. How do their combined energies compare to the energy of the single frequency that would be emitted by de-excitation from the fourth level directly to the first level? The combined energies of the two frequencies emitted by the one electrons is
A. not predictable because other factors, such as the temperature of the surroundings must also be considered. B. equal to the energy of the single frequency. C. greater than the energy of the single frequency. D. less than the energy of the single frequency.
As plastics discarded in the marine environment degrade, they can produce and concentrate
A. DDT B. bisphenol A (BPA) C. PCBs D. All of these choices are correct.
Why is it impossible to observe the processes that produce metamorphic rocks when they happen?
What will be an ideal response?
The Csa climate of Athens Greece owes its summer precipitation pattern to
A. seasonal shifts in wind direction. B. hurricanes that bring high amounts of rain. C. the moist western side of the subtropical high. D. the dry eastern side of the subtropical high.