An increase of 20 dB increases the sound intensity by a factor of
a. 10.
b. 200.
c. 100.
d. 20.
c
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What is the approximate age of the star cluster in the HR diagram below? (Hint: Main Sequence Stars of spectral between types A and B core supply of hydrogen is sufficient to last about 250 million years. Between A and F about 2 billion years.Type G about 10 billion years. Between K and M about 30 billion years..)
a.
200 million years
b.
2 billion years
c.
10 billion years
d.
30 billion years
e.
The age of the cluster can not be estimated from an HR diagram of the cluster.
The wave front shown at the left for light in air reaches the plane surface (shown by a slanted line) that bounds a medium with n = 1.50
Which diagram below correctly shows the wave front while entering the medium at the right?
A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A horizontal 140-N force is exerted on the box. What is the friction force exerted by the surface on the box?
A) 140 N B) 160 N C) 16.5 N D) 0.00 N E) 42 N
If you have one molecule of TiO2, how many molecules of O2 does it contain?
A) None, O2 is a different molecule than TiO2. B) One, TiO2 is a mixture of Ti and O2. C) Two, TiO2 is a mixture of Ti and 2 O. D) Three, TiO2 contains three molecules. E) none of the above