In a one-dimensional elastic collision of two identical masses, the masses always exchange velocities
Indicate whether the statement is true or false
TRUE
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This graph shows a gravitational wave signal recorded by the gravitational wave detectors (called LIGO) in two locations. What do models indicate was the cause of this signal?
A) the merger of two black holes in a distant galaxy B) a supernova in a distant galaxy C) the sudden explosion of an entire galaxy D) an x-ray burst on the surface of a neutron star
Based on current evidence, a supercluster is most likely to have formed in regions of space where
A) the density of dark matter was slightly higher than average when the universe was very young. B) there was an excess concentration of hydrogen gas when the universe was very young. C) supermassive black holes were present in the very early universe. D) the acceleration of the expansion was proceeding faster than elsewhere.
Two spaceships are traveling through space at 0.6c relative to the Earth. If the ships are headed directly toward each other, what is their approach velocity, as measured by a person on either craft?
A) 1.2c B) c C) 0.6c D) 0 E) none of the above
The figure shows the position of an object (moving along a straight line) as a function of time. Assume two significant figures in each number. Which of the following statements about this object is true over the interval shown?
A) The object is accelerating to the left. B) The object is accelerating to the right. C) The acceleration of the object is in the same direction as its velocity. D) The average speed of the object is 1.0 m/s.