How do astronomers know that the Crab Nebula is the remains of a supernova?
What will be an ideal response?
Both Chinese and Arab records show a guest star in the location that matches the position of the Crab Nebula. Rewinding the motion of the Crab Nebula brings it to the central object at the right time to match the observations of Chinese and Arab astronomers in 1054.
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Fusion of hydrogen nuclei is the origin of solar energy
a. True b. False Indicate whether the statement is true or false
A force on a particle depends on position such that
F(x) = (3.00 N/m2)x2 + ( 2.00 N/m)x for a particle constrained to move along the x-axis. What work is done by this force on a particle that moves from x = 0.00 m to x = 2.00 m? A) 10.0 J B) 12.0 J C) -32.0 J D) 16.0 J E) 32.0 J
Momentum: A proton, which has a mass of 1.67 × 10-27, is moving at 0.80c relative to the laboratory. What does a physicist in that lab measure for its momentum? (c = 3.0 × 108 m/s)
A. 4.0 × 10-19 kg ? m/s B. 4.4 × 10-19 kg ? m/s C. 5.0 × 10-19 kg ? m/s D. 5.8 × 10-19 kg ? m/s E. 6.7 × 10-19 kg ? m/s
Microwaves have ________ wavelengths and ________ energies compared to the visual band
a. shorter, higher b. longer, lower c. shorter, lower d. longer, higher