If during a given physical process the only force acting on an object is friction, which of the following must be assumed in regard to the object's kinetic energy?
a. It decreases.
b. It increases.
c. It remains constant.
d. It cannot be determined from the information given.
d
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Process of Science: What is Occam's razor?
A) The idea that scientists should prefer the simpler of two models that agree equally well with observations. B) The principle that everyone should agree on a theory before it is considered correct. C) A long, steep cliff on Mercury that may have been produced as the planet contracted as it formed. D) The principal that any theory can be verified by others. E) An unusual implement that Professor Occam uses to remove facial hair.
How do low mass stars transport newly formed elements into the interstellar medium?
A) stellar winds B) F supernova explosions C) formation of planetary nebula D) A and B E) A and C
You observe a distant galaxy. You find that a spectral line normally found in the visible part of the spectrum is shifted toward the infrared. What do you conclude?
A) The galaxy is moving away from you. B) The galaxy is moving toward you. C) The galaxy has very weak gravity. D) The galaxy is made purely of hydrogen. E) The composition of the galaxy is changing.
A solid cylinder of radius R = 1.0 m and mass 10 kg rotates about its axis. When its angular velocity is 10 rad/s, its angular momentum (in kg×m2/s) is
a. 50. b. 20. c. 40. d. 25. e. 70.