Main sequence stars are in hydrostatic equilibrium.

Answer the following statement true (T) or false (F)


True

Physics & Space Science

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In its orbit about the Sun, when is Venus the brightest as seen from Earth? Why?

What will be an ideal response?

Physics & Space Science

Seyferts are spirals with quasar-like nuclei

Indicate whether the statement is true or false

Physics & Space Science

The radius of a star is 6.95 × 108 m, and its rate of radiation has been measured to be 5.32 × 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of this star? (? = 5.67 × 10-8 W/m2 ? K4)

A) 6.27 × 103 K B) 8.25 × 103 K C) 8.87 × 103 K D) 3.93 × 107 K E) 5.78 × 107 K

Physics & Space Science

A person uses corrective glasses of power -8.5 D that are worn 2.0 cm from her eye

(a) Is she nearsighted or farsighted? (b) What is her far point without glasses?

Physics & Space Science