Two acceptable units for work _________________.
A) Joule
b) Newton
C) Watt
D) Newton • Meter
Answer:
A) Joule
D) Newton • Meter
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A solar collector is at 25ºC and is facing the night sky at -50ºC. If the collector emissivity is 0.9 and its absorptivity is 0.85, determine the net radiation of the solar collector.
What will be an ideal response?
Which statement best describes what used to be called the solar neutrino problem?
A) Theoretical models predict that neutrinos should be produced in the Sun, but no neutrinos had ever been observed to be coming from the Sun. B) Solar neutrinos were detected in fewer numbers than predicted by theoretical models. C) Theoretical models did not predict the production of neutrinos by the Sun, yet solar neutrinos were detected. D) Theoretical models predicted that all solar neutrinos should be destroyed before they arrive at Earth, yet neutrinos were detected on Earth. E) The neutrinos that were being detected from the Sun had much smaller masses than theoretical models could account for.
The first probe carrying mankind's message to alien civilizations was:
A) Sputnik I. B) Mariner 4. C) Pioneer 10. D) Voyager I. E) New Horizons.
The physical characteristic that is used to distinguish intrusive igneous rocks from extrusive igneous rocks is _____________
a. silica content b. hardness c. color d. grain size