Which of the following statements correctly describes the relationship between stars and constellations?
a. Only stars close to the ecliptic (the Earth's orbital plane) are located in constellations.
b. Every star is located in a constellation.
c. Only the brighter stars are in constellations.
d. Only those stars that were visible to the ancient Greeks are located in constellations.
b
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Momentum: As an electron slows down from 0.9980c to 0.5000c, how much momentum does it lose? (c = 3.0 × 108 m/s, melectron = 9.11 × 10-31 kg)
What will be an ideal response?
Heat Engines: A heat engine receives 7000 J of heat and loses 3000 J in each cycle. What is the efficiency of this engine?
A. 57% B. 30% C. 70% D. 43%
A(n) ______________ is an elementary particle with a charge of –1.6 × 10^-19 C
a. electron b. neutron c. proton d. atom
The diffusion constant for water in air is 
How long would it take a water molecule to diffuse a distance of 10.0 meters?
A. 400 hours B. 450 hours C. 500 hours D. 580 hours E. 600 hours