A certain star has a temperature twice that of the Sun and a luminosity 70 times greater than the solar value. What is its radius, in solar units

Explanation:                          

The radius (R) is related to temperature (T) and the luminosity (L) as follows:    

By solving the above equation for R we have:

With and we have:

Therefore, the radius is 2.1 times that of the Sun.

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laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.