A binary star is a pair of stars that orbit around each other. By detecting this orbital motion, and using Kepler's laws and the law of gravitation, one can directly measure the stars' ________.
A. temperatures
B. masses
C. luminosities
D. distances
Answer: B
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Within the frost line, planetesimals were composed entirely of rock, and outside the frost line, planetesimals were composed entirely of ice
Indicate whether the statement is true or false
On the H-R diagram, white dwarfs Sirius B and Procyon B lie
A) at the top right. B) at the top left. C) at the lower left. D) at the lower right. E) close to the Sun, near the center.
A boat, whose speed in still water is 8.0 m/s, crosses a river with a current of 6.0 m/s. If the boat heads perpendicular to the current, what is the speed of the boat relative to an observer standing on the shore as it crosses the river?
A) 5.3 m/s B) 10.0 m/s C) 8.0 m/s D) 6.0 m/s
A 5 500-N weight is held suspended in equilibrium by two cables. Cable 1 applies a horizontal force to the right of the object and has a tension, T1 . Cable 2 applies a force upward and to the left at an angle of 40.0° to the negative x-axis and has a tension, T2 . What is the tension, T1?
a. 4.6E+3 N b. 6.6E+3 N c. 4.2E+3 N d. 8.6E+3 N e. 1.1E+4 N