A 45.0-kg person steps on a scale in an elevator. The scale reads 460 N. What is the magnitude of the acceleration of the elevator?
A) 0.422 m/s2 B) 4.91 m/s2 C) 46.9 m/s2 D) 0.206 m/s2 E) 9.81 m/s2
A
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Exhibit 17-3Four wave functions are given below. I.y(x, t) = 5sin(4x- 20t + 4) II.y(x, t) = 5sin(3x- 12t + 5) III.y(x, t) = 5cos(4x + 24t + 6) IV.y(x, t) = 14cos(2x- 8t + 3)Use this exhibit to answer the following question(s). Refer to Exhibit 17-3. Rank the wave functions in order of the magnitude of the wavelengths, from least to greatest.
A. IV, II, I, III B. IV, I, II, III C. I, II, III, IV D. IV, II, III = I E. I = III, II, IV
How do we know whether or not global warming is caused by humans?
A) From computer calculations that "predict" 20th-century temperatures based on natural variations, then on human-caused variations, and then on a mix of natural and human variations; the actual historical measurements then show that only natural variations are important. B) From experiments in which excess carbon is injected into a laboratory-created Earth-like atmosphere, and the resulting temperature is measured. C) From experiments in which a small experimental plot of forest is subjected to excess carbon, and the growth of the trees along with the temperature are then measured. D) From computer calculations that "predict" 20th-century temperatures, based on natural variations, then on human-caused variations, and then on a mix of natural and human variations; the actual historical measurements then show the importance of human variations. E) Actually, scientists have been unable to determine this.
Define shepherd moons and give an example of them at work
What will be an ideal response?
The surface temperature of Venus is 730K, even hotter than Mercury
Indicate whether the statement is true or false