The mass range for neutron stars is
A) 0.08 to 0.4 solar masses.
B) 0.4 to 3 solar masses.
C) 1.4 to 3 solar masses.
D) 3 to 8 solar masses.
E) 6 to 11 solar masses.
C
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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.
In the atmosphere, the intensity of scattered sunlight of longer wavelength is greater than that of shorter wavelength
Indicate whether the statement is true or false
A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to a maximum height of 35 m above ground level. What is the change in mechanical energy of the mass caused by air resistance between the point of projection and the point of maximum height?
A. ?0.21 kJ B. ?0.47 kJ C. ?0.40 kJ D. ?0.34 kJ E. ?0.69 kJ
Light of wavelength 500 nm illuminates a round 0.50-mm-diameter hole. A screen is placed 6.0 m past the slit. What is the width of the central bright circle on the screen?
A) 3700 ?m B) 7.3 mm C) 15 mm D) 260 ?m