Which of the following statements is true of an eclipsing binary system?
A) When one star moves in front of the other, it blocks some of the light.
B) When one star moves in front of the other, the total brightness of the point of light increases.
C) A light curve of an eclipsing binary system is a graph of temperature versus mass.
D) When one star is in front of the other, the system looks like a dual point of light.
A
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The mer of butyl rubber has no carbon-carbon double bonds; therefore, its molecules cannot be _________with sulfur.
Fill in the blank(s) with the appropriate word(s).
Projectile Motion: A hockey puck slides off the edge of a horizontal platform with an initial velocity of 28.0 m/s horizontally in a city where the acceleration due to gravity is 9.81 m/s2. The puck experiences no significant air resistance as it falls. The height of the platform above the ground is 2.00 m. What is the angle below the horizontal of the velocity of the puck just before it hits the ground?
A. 77.2° B. 72.6° C. 12.8° D. 12.6° E. 31.8°
Which two things are the same for all observers according to the theory of relativity?
A) (1) the laws of nature and (2) the speed of light B) (1) the laws of nature and (2) the rate at which time proceeds C) (1) the speed of light and (2) the simultaneity of events D) (1) the rate at which time proceeds and (2) the simultaneity of events E) (1) the size of moving objects and (2) the mass of moving objects
Applications to Astronomy: Pulsars are rapidly spinning
A. regular stars like our sun. B. red giant stars. C. neutron stars. D. white dwarfs.