In this video, angular momentum is only approximately conserved. This is because
Choose one:
A. there are small external forces acting—friction and air resistance, for example.
B. no quantities are ever really conserved.
C. the person on the platform is exerting a force when she pulls her arms in and pushes them out.
D. the measurement of angular momentum depends on your reference frame.
A. there are small external forces acting—friction and air resistance, for example.
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The difference between a LED and a laser is that a LED has spontaneous photon emission, and a laser has _________photon emission.
Fill in the blank(s) with the appropriate word(s).
Projectile Motion: As shown in the figure, a projectile is fired at time t = 0.00 s, from point 0 at the upper edge of a cliff, with initial velocity components of v0x = 30 m/s and v0y = 300 m/s. The projectile rises and then falls into the sea at point P. The time of flight of the projectile is 75.0 s, and air resistance is negligible. At this location, g = 9.80 m/s2. What is the horizontal distance D? 
A. 2250 m B. 2520 m C. 2790 m D. 3060 m E. 3330 m
If we observe one edge of a planet to be redshifted and the opposite edge to be blueshifted, what can we conclude about the planet?
A) The planet is rotating. B) We must actually be observing moons orbiting the planet in opposite directions, not the planet itself. C) The planet is in the process of falling apart. D) The planet is in the process of formation.
The reaction energy associated with a nuclear reaction is
a. the total change in rest energy as a result of the reaction. b. equivalent to the disintegration energy. c. the minimum energy necessary for such a reaction to occur. d. called the threshold energy. e. the binding energy of the nucleons.