Waves on a String: A 15-m rope is pulled taut with a tension of 140 N. It takes 0.545 s for a wave to propagate along the rope. What is the mass of the rope?
A. 1.7 kg
B. 2.1 kg
C. 2.8 kg
D. 5.1 kg
E. 3.2 kg
Answer: C
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a. ecosystem b. community c. biosphere d. organism e. population
Which layer of the Sun do we normally see?
A) photosphere B) corona C) chromosphere D) convection zone E) radiation zone
According to the philosophy of Democritus,
A) the color red is not "real" but is instead just humans' "conjecture" or imagination. B) atoms are not "real" but are instead just humans' "conjecture" or imagination. C) Both of the above. D) Neither of the above. E) the moon is really a giant frog.
Science works efficiently by
a. testing models and keeping only those that work. b. stating facts that need to be memorized. c. rewarding those who prove things about how Nature works. d. asking for answers to all pressing human problems. e. valuing all models no matter what happens in experiments.