The data points on this graph represent the measured spectrum of the cosmic microwave background, while the solid curve represents a theoretically calculated thermal radiation spectrum for a temperature of 2.73 K. What is the significance of the near-perfect match between the data and the theoretical spectrum?
A) It shows that the cosmic microwave background has a thermal radiation spectrum, just as the Big Bang theory predicts it should.
B) It shows that all objects in the universe emit thermal radiation.
C) It tells us the average temperature of gas in the Milky Way Galaxy.
D) It demonstrates that the universe must contain more dark matter than ordinary matter.
A) It shows that the cosmic microwave background has a thermal radiation spectrum, just as
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A car is traveling north at 1.77m/s. After 12 s its velocity is in the same direction. Find the magnitude and direction of the car's average acceleration
A) 0.30 m/s2, south B) 2.7 m/s2, south C) 0.30 m/s2, north D) 2.7 m/s2, north
The lunar mare are found:
A) anywhere large meteor impacts created deep basins. B) almost entirely on the far side, which was more likely to be hit. C) almost entirely on Earth side, where the crust was thinner. D) mainly in the south polar region, where the largest impact occurred. E) not at all, since no liquid water really exists on the Moon.
When a proton is traveling at 0.80c, what is the ratio of its kinetic energy to its rest energy?
A) 0.60 B) 0.67 C) 0.80 D) 1.2 E) 1.7
The same object in different inertial reference systems:
a. will always have the same kinetic energy, regardless of the reference system. b. can have different amounts of kinetic energy viewed from each inertial reference system. c. cannot be studied from two different reference systems. d. can have different amounts of gravitational potential energy in different reference systems, but will always have the same amount of kinetic energy. e. sometimes conserves energy and sometimes does not, depending on inertial reference system.