Mercury and the Earth have about the same average density, but Mercury's core is much larger, compared to the size of the body
Indicate whether the statement is true or false
TRUE
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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.
If air were a better conductor, at nighttime Earth would be
A) considerably colder. B) considerably warmer. C) not appreciably different in temperature.
Which of the fields are physically impossible and why?
A. This field violates Faraday’s law. B. This field violates Gauss’s law. C. This field violates both of the above laws. D. This field is physically possible.
Transformers: You need an ideal transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. The primary circuit has 130 windings and the secondary circuit is completed through a 55-? resistor. How many windings should the secondary circuit contain?
Fill in the blank(s) with the appropriate word(s).