This graph shows that the orbit of a binary pulsar is decaying just as general relativity predicts it should (notice the agreement between data and theory). What is the significance of this particular result?
A) It supports the prediction that orbiting stars will radiate energy outward in the form of gravitational waves.
B) It tells us that time runs slower in this binary system than on Earth.
C) It confirms that gravitational lensing can really occur.
D) It shows that general relativity can explain all known natural phenomena.
A) It supports the prediction that orbiting stars will radiate energy outward in the form of gravitational waves.
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The electrical resistivity of pure copper metal at 0°C is 1.6×10-8 ??m. An alloy of 1.12 atom % nickel, which is substitutional in copper, produced with this copper has an electrical resistivity at 0°C of 3×10-8 ??m. What is the electrical resistivity of an alloy produced from this copper with 3.32 atom % nickel at 0°C?
What will be an ideal response?
One _____ equals the distance to an imaginary star that has a parallax of 1 arc second
A) parsec B) light year C) astronomical unit D) kilometer
Without greenhouse gases, Earth's surface would be frozen over
Indicate whether the statement is true or false
Communications and weather satellites always appear at the same place in the sky because these satellites are
A) beyond the pull of Earth's gravitational field. B) moving at a speed just short of escape velocity. C) orbiting Earth with a 24-hour period. D) stationary in space. E) none of the above