Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in parallel with the previous lightbulbs, and again take note of the brightness. Repeat the process with the third lightbulb, connecting it in parallel with the other two. As the lightbulbs are added, the power
delivered by the battery (neglect the battery’s internal resistance)
1.increases.
2.decreases.
3.remains the same.
4.Need more information.
1
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Rich galactic clusters ____
a. are rare, because galaxies are usually isolated in space b. contain gas that is rich in metals c. are composed of mostly elliptical galaxies d. are very spread out, without a defined center e. contain a wide variety of galaxy types and sizes
Diatomic molecules such as 
and
undergo simple harmonic motion with frequencies that obey Hooke’s Law with the effective mass being half the atomic mass. If the mass of an oxygen atom is 2.66 x 
kg, and the observed frequency of oscillation is 
Hz, what is the effective spring constant associated with the bond between the atoms in an oxygen molecule 
A. 1140 N/m B. 182 N/m C. 116 N/m D. 29 N/m E. 2290 N/m
Transverse waves are traveling on a 1.00-m-long piano string at 500 m/s. If the points of zero vibration occur at one-half wavelength (where the string is fastened at both ends), find the frequency of vibration.
A. 250 Hz B. 500 Hz C. 1000 Hz D. 2000 Hz E. 2500 Hz
In what way is Mercury's core unusual?
What will be an ideal response?