According to Kepler's second law, Halley's Comet circles the Sun in an elliptical path with the Sun at one focus of the ellipse. What is at the other focus of the ellipse?
a. nothing
b. the Earth
c. The comet itself passes through the other focus.
d. The tail of the comet stays at the other ellipse.
a
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Hubble's constant is related to the age of the universe, but the precise relationship depends on the way in which the expansion rate changes with time. For a given value of Hubble's constant (such as 22 km/s/Mly), the age of the universe is oldest if
A) the expansion rate has been increasing with time (an accelerating universe). B) the expansion rate has remained nearly constant with time (a coasting universe). C) the expansion rate slows ever more gradually with time (a critical universe). D) the expansion rate is slowing enough that it will eventually reverse (a recollapsing universe).
A 2.0-kg ball is moving with a constant speed of 5.0 m/s in a horizontal circle whose diameter is 1.0 m. What is the magnitude of the sum of the forces exerted on the ball?
A) 0 N B) 20 N C) 40 N D) 50 N E) 100 N
An electron is known to be confined to a region of width 0.10 nm
What is an approximate value for the least kinetic energy it could have, in electron-volts? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J, (melectron = 9.11 × 10-31 kg) A) 3.8 eV B) 1.1 eV C) 0.88 eV D) 17 eV E) 8.8 eV
Your vocal cords are used to produce all the sounds you make while speaking
Indicate whether the statement is true or false