A satellite is in a circular orbit 600 km above the Earth's surface. The acceleration of gravity is 8.21 m/s2 at this altitude. The radius of the Earth is 6400 km. Determine the speed of the satellite, and the time to complete one orbit around the Earth
7580 m/s, 5800 s
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According to current evidence, Pluto is best explained as ________
A) an escaped moon of Jupiter or Saturn B) a large member of the Kuiper belt C) a terrestrial planet that is surprisingly far from the Sun D) a very small jovian planet
Why didn't elements heavier than helium form in the first minutes of creation?
A) When He-4 was formed, the expansion cooled the cosmos below 100 million K. B) The first generation of stars used them up too quickly to observe them. C) The electrons slowed down enough to be captured into orbits by protons. D) There was not enough matter in the universe at that time. E) Only Type I supernovae can produce iron and heavier elements.
Which of the following is a statement of the third law of thermodynamics?
A) If two objects are in equilibrium with a third, then they are in thermal equilibrium with one another. B) The entropy of the universe cannot decrease. C) The entropy of the universe cannot increase. D) All reversible engines operating between the same two temperatures have the same efficiency. E) It is impossible to lower the temperature of an object to absolute zero in a finite number of steps.
A particular chemical reaction occurs at room temperature (293 K) at half the rate that it does at 300 K. What is the activation energy for this reaction?
a. 
b. 
c. 
d. 