Free fall is the motion of an object subject only to the influence of gravity
Indicate whether the statement is true or false
TRUE
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Quasar spectra often show many absorption lines that all appear to be due to the same electron transition (such as level 1 to level 2 in hydrogen) but that fall at different wavelengths in the spectrum. Why do we think this is the case?
A) We are seeing absorption lines from clouds of gas that lie between us and the quasar, and therefore each cloud has a different redshift. B) Quasars are rotating rapidly, and this rotation produces spectral lines with a wide variety of Doppler shifts. C) The lines fall at different wavelengths because they are produced by different chemical elements. D) No one knows—it remains perhaps the greatest mystery about quasars.
A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?
A. 2.0 m/s B. 2.7 m/s C. 4.9 m/s D. 2.4 m/s E. 3.6 m/s
A bullet is fired horizontally at a target 20 m away. The velocity of the bullet as it leaves the gun is 200 m/s. How much, approximately, will the bullet drop on its way to the target?
A. 0.4 m B. 0.3 m C. 0.2 m D. 0.05 m E. 0.1 m
The movement of Earth's water supply from the oceans to the atmosphere and back again is called the ______________
Fill in the blank(s) with correct word