Doppler-shift observations of a spectroscopic binary star can enable astronomers to calculate ________ of its individual stars
a. the minimum masses
b. the sizes
c. both minimum masses and sizes
d. neither minimum masses nor sizes
a
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If no net external force acts on a system, the total momentum of the system is a conserved quantity
Indicate whether the statement is true or false
A thin metallic shell of radius 40 cm has a charge of -25 nC on it. At the center of the sphere is a point charge of 35 nC. What is the electric field 15 cm from the center of the shell?
a. 
b. 
c. 
d. 
e. 
In Part A, you found that Planet Z should not have polar ice caps or liquid water. What single change to Planet Z's characteristics would allow it to have these things?
a. a larger size b. a larger axis tilt c. a greater distance from its star d. a smaller size
AC ammeters and voltmeters read:
1.peak-to-valley values 2.maximum values 3.rms values 4.average values