What is hot dark matter?
A) a type of electron that moves more rapidly than ordinary electrons do.
B) hypothetical heavy fundamental particles that interact with baryons only through gravity and the weak force.
C) hypothetical low mass particles that travel close to the speed of light but do not emit radiation.
D) a type of proton that moves more rapidly than ordinary protons do.
E) a type of neutron that moves more rapidly than ordinary neutrons do.
Ans: C) hypothetical low mass particles that travel close to the speed of light but do not emit radiation.
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Compound Microscope: A simple compound microscope normally uses
A. a short focal length objective and a shorter focal length eyepiece. B. a short focal length objective and a longer focal length eyepiece. C. a long focal length objective and a shorter focal length eyepiece. D. a very long focal length objective and a longer focal length eyepiece.
Where did comets that are now in the Kuiper belt originally form?
A) in the asteroid belt B) inside Jupiter's orbit C) between the orbits of Jupiter and Neptune D) near the distance at which they orbit today E) in the Oort cloud
Consider two less-than-desirable options. In the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. In the second option you are driving 30 mph and crash head-on into a stationary brick wall
In neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. Which of these two situations would result in the greatest impact force? A) hitting the other car B) hitting the brick wall C) The force would be the same in both cases. D) We cannot answer this question without more information. E) None of these is true.
A 2.00-L container holds half a mole of an ideal gas at a pressure of 12.0 atm. What is the gas temperature? (R = 0.082 1 L/atm/mol/K)
a. 292 K b. 438 K c. 731 K d. 585 K e. 365 K