Astronomers have discovered two black holes in the process of merging
Indicate whether the statement is true or false
TRUE
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Why use nuclear power on a satellite?
a. It can supply energy for many years on long space missions. b. Solar cells don't work well in the outer solar system far from the sun. c. Sending radioactive materials into space is a good way to get rid of them so they don't create a hazard on earth. d. all of the above
Which statement best describes the solar neutrino problem?
A) Theoretical models predict that neutrinos should be produced in the Sun, but no neutrinos have ever been observed to be coming from the Sun. B) Solar neutrinos were detected but in fewer numbers than predicted by theoretical models. C) No one understands how it can be possible for neutrinos to be produced in the Sun. D) Our current understanding of fusion in the Sun suggests that all neutrinos should be destroyed before they arrive at Earth, yet neutrinos are being detected. E) The term solar neutrino problem refers to the fact that neutrinos are extremely difficult to detect.
Series/Parallel Circuits: For the circuit shown in the figure, the current in the 8.0-? resistor is 0.50A. What is the current in the 2.0-? resistor? All the numbers shown are accurate to two significant figures.
A. 2.25 A B. 0.75 A C. 4.5 A D. 9.5 A E. 6.4 A
Which of the following statements about the greenhouse effect is true?
A) The burning of fossil fuels increases the greenhouse effect on Earth because of the release of carbon dioxide. B) A weak greenhouse effect operates on Mars. C) Without the naturally occurring greenhouse effect, Earth would be too cold to have liquid oceans. D) One result of an increased greenhouse effect on Earth may be an increased number of severe storms. E) All of the above are true.