A baseball pitcher throws a curveball, and Bernoulli's Principle gives a fair description of why it takes such a drastic curve. If that pitcher could throw the exact same pitch on the Moon, then
A. it would curve more drastically, because gravity is so much weaker on the Moon.
B. it would curve but not as much as on Earth, since the Moon's gravity is so weak.
C. it would curve more drastically, because there is no counterforce from air pressure on the Moon.
D. it would not curve at all, because the Moon has no atmosphere.
Answer: D
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A capacitor is connected to the terminals of a variable frequency oscillator. The peak voltage of the source in kept fixed while the frequency is increased. Which statement is true?
A. The rms current through the capacitor decreases. B. The rms current through the capacitor increases. C. The phase angle between the current and source voltage changes. D. The current becomes zero when the frequency is large enough.
In units of measurement, power in watts is equal to
A) amperes x ohms. B) amperes x volts. C) amperes/second. D) volts/second. E) none of the above
Briefly explain why we think white-dwarf supernovae are useful for measuring cosmic distances
What will be an ideal response?
When a laboratory sample of unknown mass is placed on a vertical spring-scale having a force constant (spring constant) of 467 N/m, the system obeys the equation y = (4.4 cm) cos(33.3 s-1 t). What is the mass of this laboratory sample?
What will be an ideal response?