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.
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
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?
