Answer the following statement(s) true (T) or false (F)
1. The angular momentum of a particle can be nonzero even if it moves in a straight line.
2. The angular momentum (around a rotating rigid object’s center of mass) of an arbitrary particle in that object points directly along the object’s rotation axis.
1. TRUE
2. FALSE
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The calculated Schwarzschild radius of a 2-Mo black hole is approximately
a. 6 km. b. 4 km. c. 2 km. d. 12 km. e. 36 km.
We can see each other in the classroom right now because we
A) emit visible light. B) emit thermal radiation. C) emit infrared light. D) reflect visible light. E) reflect infrared light.
In what way did Galileo improve on the physics of Aristotle?
A) Galileo understood that "natural" (or unforced) motion occurs at constant velocity. B) Galileo understood that energy is always conserved in every physical process. C) Galileo understood that the gravitational force acts between every pair of objects in the universe. D) Galileo understood that a force is needed to keep an object moving at constant velocity. E) Galileo understood that no force is needed to keep an object moving in a circle at constant speed.
An object of mass 4 kg starts at rest from the top of a rough inclined plane of height 10 m as shown in Fig. 8-9
If the speed of the object at the bottom of the inclined plane is 10 m/s, how much work is done by the force of friction? Use g = 10 m/s2. A) -100 J B) 100 J C) 0 D) -200 J E) 200 J