Dark matter is made of
A) slow-moving "magnetons" that were created during the big bang.
B) fast moving "gluons" that were created during the big bang.
C) Both of the above.
D) an unknown material that has never been directly observed in laboratories.
E) soap bubbles.
D
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We know that giant stars are larger in diameter than the Sun because
a. they are more luminous but have about the same temperature. b. they are less luminous but have about the same temperature. c. they are hotter but have about the same luminosity. d. they are cooler but have about the same luminosity. e. they have a larger absolute magnitude than the Sun.
Which forces have physicists shown to be the same force under conditions of very high temperature, as confirmed by experiments in particle accelerators?
A) the electromagnetic and weak forces B) gravity and the strong force C) the strong and electromagnetic forces D) the strong and weak forces E) gravity and the weak force
A truck is using a hook to tow a car whose mass is one quarter that of the truck. If the force exerted by the truck on the car is 6000 N, then the force exerted by the car on the truck is
A) 12000 N. B) 24000 N. C) 1500 N. D) 6000 N. E) We need to know if the car is accelerating to answer this question.
When you stretch a rubber band, you are applying
A) compressional stress. B) tensional stress. C) shear stress. D) simple stress.