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.
C
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Centripetal means
a. center seeking b. pulls outward c. constant d. fast e. none of these
A 15-turn rectangular loop of wire of width 10 cm and length 20 cm has a current of 2.5 A flowing through it. Two sides of the loop are oriented parallel to a uniform magnetic field of strength 0.037 T,
and the other two sides are perpendicular to the magnetic field. (a) What is the magnitude of the magnetic moment of the loop? (b) What torque does the magnetic field exert on the loop?
In what phase of matter are the particles no longer moving?
A) solid B) liquid C) gas D) none of the above
Choose the correct terms to make the statement correct: ___Chemical/Biological__ evolution occurs before __chemical/biological____ evolution
Fill in the blank(s) with correct word