This graph shows how the apparent brightness of an eclipsing binary system changes with time. Which of the four labeled regions represents the system at a time when one star is eclipsing the other?
A) I
B) II
C) III
D) IV
E) both II and IV
F) both I and II
E) both II and IV
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A 60-kg (including the passenger) sled is subject to a net force of 20 N pushing in the direction of the sled's motion as it is moving over a horizontal surface for a distance of 11 m after having started from rest. At this point the sled is released as it starts down a 10.0° incline. However, the snow is not very deep, and the sled stops after having moved an additional 35 m. What is the work
done by friction while the sled is on the incline? a. –3.6E+3 J b. –3.8E+3 J c. –3.4E+3 J d. –2.0E+4 J
Unlike spirals, elliptical galaxies do not contain a flattened disk
Indicate whether the statement is true or false
Starship "Alpha" travels at 0.9c past an identical starship "Beta," which is at rest. Both a cabin boy on the "Alpha" and a cook on the "Beta" measure the time required for the other ship to pass by their respective windows. Who measures the longer time?
A. The cabin boy B. Both measure the same time C. The measured times cannot be compared D. The cook
How do seismic waves show that the outer core of Earth is liquid?
What will be an ideal response?