Assuming that we can measure the apparent brightness of a star, what does the inverse square law for light allow us to do?
A) Calculate the star's luminosity if we know its distance, or calculate its distance if we know its luminosity.
B) Determine both the star's distance and luminosity from its apparent brightness.
C) Determine the distance to the star from its apparent brightness.
D) Calculate the star's surface temperature if we know either its luminosity or its distance.
A) Calculate the star's luminosity if we know its distance, or calculate its distance if we know its luminosity.
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A. 12.7 ? B. 78.6 ? C. 109 ? D. 154 ?
Why does Earth have an ultraviolet-absorbing stratosphere, while Venus and Mars do not?
What will be an ideal response?
A 30-cm steel rod, 1.0 cm in diameter, supports a 300-kg mass. What is the change in length of the rod? Young's modulus for steel is 20 × 1010 N/m2
A) 5.6 × 10-5 m B) 6.5 × 10-5 m C) 5.6 × 10-6 m D) 6.5 × 10-6 m E) 6.5 × 10-4 m
Which of the following materials would you predict to be ductile at 50 K?
(a) Pure BCC iron (b) Pure FCC copper (c) Pure HCP titanium (d) PE