The method of standard candles can be used to measure a star's ________.
A. luminosity
B. brightness
C. mass
D. distance
E. absolute magnitude
Answer: D
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A(n) ____________________ is a subatomic particle produced in nuclear fusion that can travel through the sun and escape to space without interacting with any particles in the sun
Fill in the blank(s) with correct word
Resistance and Resistivity: How much current will flow through a 40.0-m length of metal wire with a radius of 4.0 mm if it is connected to a power source supplying 16.0 V? The resistivity of the metal is 1.68 × 10-8 ? ? m.
A. 1200 A B. 9.5 × 108 A C. 68 nA D. 710 A
According to Kepler's laws, Halley's Comet circles the Sun in an elliptical path with the Sun at one focus of the ellipse. What is it that Kepler's laws indicate 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 focus.
The gravitational force between two objects is inversely proportional to
A) the distance between the two objects. B) the square of the distance between the two objects. C) the product of the masses of the two objects. D) the square of the product of the masses of the two objects. E) none of the above