What types of stars end their lives with supernovae?
A) all stars that are yellow in color
B) stars that are at least several times the mass of the Sun
C) all stars that are red in color
D) stars that are similar in mass to the Sun
E) stars that have reached an age of 10 billion years
B
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Two uncharged metal spheres, #1 and #2, are mounted on insulating support rods. A third metal sphere, carrying a positive charge, is then placed near #2. Now a copper wire is momentarily connected between #1 and #2 and then removed
Finally, sphere #3 is removed. In this final state A) spheres #1 and #2 are still uncharged. B) sphere #1 carries positive charge and #2 carries negative charge. C) sphere #1 carries negative charge and #2 carries positive charge. D) spheres #1 and #2 both carry positive charge. E) spheres #1 and #2 both carry negative charge.
A sled weighs 325 N. It is held in place on a frictionless 30.0° slope by a rope attached to a stake at the top; the rope is parallel to the slope. Find the tension in the rope
a. 281 N b. 650 N c. 375 N d. 163 N e. 188 N
While the government cannot guarantee health and safety for each individual, its role is to provide for maximum health and safety for the community as a whole.
a. true b. false
Because of refraction, the Sun near sunset appears
A) higher in the sky. B) lower in the sky. C) farther away.