What information can be gained from the light curves of eclipsing binaries?
A) their masses
B) their distances
C) their luminosities
D) their temperatures
E) their sizes
E
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Giant molecular cloud complexes are located in spiral arms
a. True b. False Indicate whether the statement is true or false
Impulse: A forklift pushes a 100-kg crate, starting from rest, with a horizontal force of magnitude F. The graph in the figure shows the x component of this force as a function of time. What is the instantaneous velocity of the crate at time t = 10 s?
A. 25 cm/s B. 0.00 cm/s C. 75 cm/s D. -25 cm/s E. -75 cm/s
A 100-W lamp glows brighter than a 25-W lamp. The current drawn by the 100-W lamp is
A) less. B) greater. C) the same.
From the energy that is input into an engine on each cycle, 500 kJ of mechanical work are produced and 600 kJ of heat are exhausted into the environment. What is the efficiency of the engine?
A) 45.5% B) 28.6% C) 90.0% D) 75.0% E) 83.3%