How is the geometrical structure of the universe today related to the presence of matter in the universe? How is this related to the future history of the universe?
What will be an ideal response?
The geometrical structure of the universe has positive curvature (closed, as with a sphere), negative curvature (open, as with a saddle shape), or is flat. This depends on whether the density of the universe is above, below, or exactly at critical. If above, the universe will eventually collapse back on itself. If below, the universe will expand forever. If critical, the universe will brake to an exact halt after an infinite amount of time.
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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
The maximum value of the electric field in an electromagnetic wave is 2.0 V/m. What is the maximum value of the magnetic field?
A) 6.7 pT B) 6.7 mT C) 6.7 nT D) 6.7 ?T E) 6.7 T
An FM radio station broadcasts at 98.6 MHz. What is the wavelength of the radiowaves?
a. 60.8 m b. 6.08 m c. 3.04 m d. 0.314 m e. 0.33 cm
According to fossil evidence, how far back in time did life on Earth exist?
A) about 545 million years B) about 2.0 billion years C) about 65 million years D) about 3.5 billion years or more