The brightest main-sequence star in a cluster has a surface temperature of 30,000 K and a luminosity of about 104 LSun. Referring to the figure above as needed, what is the approximate age of the cluster?

A) 107 years
B) 109 years
C) 1011 years
D) 1013 years


A) 107 years

Physics & Space Science

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The last page of a book is numbered 764 the book is 3.0 cm thick not including its covers. What is the average thickness in centimeters of a page in the book rounded to the proper number of significant figures

A) 0.0039 cm
B) 0.072 cm
C) 0.0079 cm
D) 0.00393 cm
E) 0.00785 cm

Physics & Space Science

Which main sequence stars have the lowest mass?

A) spectral type O B) spectral type M C) spectral type A D) spectral type G E) can't tell from information provided

Physics & Space Science

You can safely stand on the overhanging end of a heavy plank that rests on a table. How much overhang depends on your mass and the mass of the plank

If you can stand on the end of a plank that overhangs the edge of the supporting table 1/5 its total length, how massive is the plank compared to your mass? A) 1/3 B) the same C) 2/3 D) 1 and 1/3 times E) more than 1 and 1/3 times

Physics & Space Science

In what way could the Huygens probe be considered a first?

What will be an ideal response?

Physics & Space Science