Which of the following is true about the universe? a) It is an open system b) It is a closed system c) It is an isolated system d) It is an international system
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Which of the following is true about the universe?
a) It is an open system
b) It is a closed system
c) It is an isolated system
d) It is an international system
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- In an open universe, the overall geometry of the Universe would be a. flat b. spherical c. hyperbolicIn 1999, scientists discovered a new class of black holes with masses 100 to 10,000 times the mass of our sun that occupy less space than our moon. Suppose that one of these black holes has a mass of 1x10^3 suns and a radius equal to one-half the radius of our moon. What is the density of the black hole in g/cm^3? The radius of our sun is 7.0x10^5 km, and it has an average density of 1.4x10^3 kg/m^3. The diameter of the moon is 2.16x10^3 miles.3 From Wikipedia: "Various sources state the first Death Star has a diameter of approximately 140 kilometers." A) In order to stand on the surface of the Death Star and experience the familiar gravitational acceleration of g = 9.8 m/s², what is the required mass of the Death Star? Calculate the density as well (yikes!) B) An escape pod is now launched from the surface of the Death Star at speed v₁ = 760 m/s. How fast is the pod moving when it reaches a distance of 130 km from the center of the Death Star? Star
- The sun orbits the center of the Milky Way galaxy for a period of 2.5x10^8 years. (a) Assuming a circular orbit of radius 2.4x10^20 m, compute the mass of the Milky Way. (b) Estimate the number of stars in the Milky Way, assuming the average star mass equals the mass of the sun—2.0x10^30 kgPlease list 4 different forms of energy present in the universe?The density of the universe is a. equal to the critical density if the universe is closed. b. equal to the critical density if the universe is flat. c. greater than the critical density if the universe is flat. d. greater than the critical density if the universe is open. e. none of the above.