A football is thrown upward at a 30.0° angle to the horizontal. To throw a 40.0-m pass, what must be the initial speed of the ball?
21.3 m/s
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Capacitors in Combination: A group of 1.0-?F, 2.0-?F, and 3.0-?F capacitors is connected in parallel across a 24-V potential difference (a battery). How much energy is stored in this three-capacitor combination when the capacitors are fully charged?
A. 1.7 mJ B. 2.1 mJ C. 4.8 mJ D. 7.1 mJ
Why doesn't the uncertainty principle affect our ability to follow the path of a baseball?
A) The uncertainty principle applies only to subatomic particles. B) The uncertainties in all the individual atoms within the baseball cancel each other out. C) The uncertainties in the position and momentum of the baseball are so small in comparison to its size and total momentum that they are unnoticeable. D) The exclusion principle says that large objects are excluded from the consequences of the uncertainty principle. E) The uncertainty principle does not have anything to do with following the path of a particle or an object.
G-, K-, and M-type stars
A) do not contain enough heavy elements to form planets B) have lifetimes long enough for planets to form and for simple life to appear, but not long enough for advanced life to develop C) have lifetimes too short for planet formation D) have lifetimes long enough for advanced life to evolve
A helium balloon rises because of __________ principle
Fill in the blank(s) with correct word