The cosmic microwave background (CMB) radiation is
A. radiation from pulsars.
B. energy emitted by black holes at the centers of the nearby galaxies.
C. light from distant stars.
D. light from gravitational lenses.
E. radiation from the birth of the Universe.
Answer: E
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Equilibrium: A 100-kg nonuniform boom that is 6.0 m long is loosely pinned at the pivot at P. A 600-kg concrete block is suspended from the end of the boom at A, as shown in the figure. The boom forms a 30° angle above the horizontal, and is supported by a 4.0-m cable between points D and B. Point B is 4.0 m from P, and point D is 4.0 m above P. The center of mass of the boom is at point C, which is 2.0 m from P. Assume that all the quantities shown in the figure are accurate to two significant figures. What is the tension in the cable connected between points B and D?
A. 9300 N B. 8400 N C. 8100 N D. 7500 N E. 6900 N
Why do astronomers need different telescope designs to observe across the electromagnetic spectrum?
A) New telescopes incorporate new technology to increase their efficiency. B) Telescopes have to adapt to the greater distortion of the atmosphere at shorter wavelengths. C) Photons of different energy have different wavelengths, some of which are not accessible from Earth's surface and require different collection strategies. D) Light pollution is worse at radio wavelengths than visible wavelengths. E) Astronomers and engineers enjoy the challenge of making new telescope designs.
What would the spectrum of hydrogen look like if we could see into the ultraviolet?
What will be an ideal response?
Novae always occur in a close binary star system
Indicate whether the statement is true or false