The flatness problem and horizon problem
a. are solved if there was a sudden inflation of the universe at time before recombination occurred.
b. show that the universe can be described as static and unchanging.
c. show that dark matter must be a small fraction of the total mass of the universe.
d. imply that the universe was once much colder than it is now.
e. imply that the inflationary theory is incorrect.
A
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Intensity of Sound: At a distance of 15.0 m from a sound source, the intensity level is 60.0 dB. What is the intensity level (in decibels) at a point 2.00 m from the source if the source radiates equally in all directions?
A. 55.7 dB B. 57.5 dB C. 75.5 dB D. 77.5 dB
A steel lift column in a service station is a solid cylinder 4.0 m long and 0.20 m in diameter. Young's modulus for this steel is 20 × 1010 N/m2. By what distance does the column compress when a 5000-kg truck is on it?
A) 4.7 × 10-7 m B) 8.0 × 10-7 m C) 3.2 × 10-6 m D) 7.8 × 10-6 m E) 3.1 × 10-5 m
At what wavelength would a star radiate the greatest amount of energy if the star has a surface temperature of 60,000 K?
a. 50 nm b. 500 nm c. 300 nm d. 1.8 × 10^11 nm e. 180 nm
Why are sunsets and sunrises red?
What will be an ideal response?