Mid-sized black holes of a few thousand solar masses have been found in the cores of some
a. open clusters.
b. emission nebulae.
c. elliptical galaxies.
d. globular clusters.
e. dark molecular clouds.
D
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During a snowball fight two balls with masses of 0.30 and 0.70 kg, respectively, are thrown in such a manner that they meet head-on and combine to form a single mass. The magnitude of initial velocity for each is 12.0 m/s. What is the speed of the 1.0-kg mass immediately after collision?
a. zero b. 4.8 m/s c. 12 m/s d. 8.4 m/s e. 3.6 m/s
You press a stick that has a varying cross-sectional area horizontally between the palms of your hands. The area of the stick pushing against your left palm is twice the area of the stick pushing against your right palm.The pressure on your left palm is ____________ the pressure on your right palm
a. 1/4 b. 1/2 c. equal to d. 2 times e. 4 times
A soap bubble (n = 1.35) is floating in air. If the thickness of the bubble wall is 115 nm, what visible light wavelength is most strongly reflected?
A positively charged ion is called a(n) ______________
Fill in the blank(s) with correct word