Which of the following is not consistent with the major hallmarks of science?
A) A scientific model must make testable predictions.
B) Science progresses through the creation and testing of models that explain observation as simply as possible.
C) Scientific explanations should be based solely on natural causes.
D) Science consists of proven theories that are understood to be true explanations of reality.
D
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It was the Chinese who provided critical ancient data on supernovae and comets
Indicate whether the statement is true or false
Which statement is not thought to be true of all comets in our solar system?
A) Comets always have tails. B) All comets are icy in composition. C) All comets orbit the Sun. D) All comets are leftover planetesimals that originally condensed beyond the frost line in the solar nebula.
A super train is moving along a track at a speed close to the speed of light. You are watching the train from the ground. You observe lightning to strike in two places along the track, a mile apart, at precisely the same time
What would someone on the train say? A) The two bolts of lightning struck at different times, and they struck at places that are more than a mile apart. B) The two bolts of lightning struck at the same time, and they struck at places that are less than a mile apart. C) The two bolts of lightning struck at different times, and they struck at places that are precisely a mile apart. D) The two bolts of lightning struck at different times, and they struck at places that are less than a mile apart.
A blow dryer with a resistance of 6 ohms is plugged into a 60-volt battery. How much current does it draw?
A) 30 amps B) 360 amps C) 0.1 amp D) 10 amps E) 6 amps