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Question
A scale reads 114 N when a piece of brass is hanging from it. What does it read (in N) when it is lowered so that the brass is submerged in water?
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2. The discovery of red shift in galaxy spectra indicated that _____________________________ .
1. In 1929, Edwin Hubble discovered that many apparent âstarsâ or âcloudsâin space were actually _____________ .
3. After hyperinflation ended what formed instantly?
4. A fraction of a second later, what formed from the sea of quarks and other particles?
5. By 400,000 years after the Big Bang, what simple elements formed?
6. What prevented other elements from forming?
7. The other 90 elements besides H and He are formed where?
8. What does the dark matter hypothesis explain and why?
9. What does the dark energy hypothesis explain and why?
10. Correctly put the following events in order from: A through F
A first stars
B ultra-high temperatures, pure energy, and hyperinflation
C neutrons and protons and electrons
D galaxies
E quarks and other elementary particles
F Hydrogen (H) and Helium (He) atoms
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An object at an initial temperature of 27 oC is raised to a temperature of 877 oC. How much more energy does the object emit as blackbody radiation at the higher temperature compared to the lower temperature?
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A passenger jet flies from one airport to another 1,213 miles away in 2.4 h. Find its average speed.
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