In the context of measuring the properties of galaxies, _____ are examples of a standard candle
A) Cepheid variable stars
B) white dwarf stars
C) M stars
D) red giant stars
A
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An aluminum ball is subjected to a pressure of 
The bulk strain is 
What is the bulk modulus?
a. 
b. 
c. 
d. 
e. 
Electrons emerge from an electron gun with a speed of 2.0 × 106 m/s and then pass through a double-slit apparatus. Interference fringes with spacing of 2.7 mm are detected on a screen far from the double slit
What would the fringe spacing be if the electrons were replaced by neutrons with the same speed? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg, mneutron = 1.675 × 10-27 kg) A) 1.5 ?m B) 4.9 m C) 0.93 nm D) 1.2 km
The aberration of starlight gives proof that Earth is
a. rotating. b. revolving. c. precessing. d. none of these.
Simple Pendulum: In 1851 Jean Bernard Leon Foucault demonstrated the rotation of the earth using a pendulum 11.0 m long, which was set up in the Paris Observatory. How long would it have taken for Foucault's pendulum to make one complete swing back to its starting point if g = 9.81 m/s2 at the observatory?
A. 6.65 s B. 5.63 s C. 1.79 s D. 2.12 s E. 2.58 s