Based on the observed amount of deuterium in the universe, we can conclude that
A) ordinary (baryonic) matter makes 75 percent of the mass of the universe.
B) neutrons outnumber protons 7 to 1 in the universe.
C) most of the deuterium that was created in the early universe has since been destroyed.
D) the density of ordinary (baryonic) matter is about 5 percent of the critical density.
E) the density of the universe equals the critical density.
D) the density of ordinary (baryonic) matter is about 5 percent of the critical density.
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A ball is thrown straight up with a speed of 30 m/s, and air resistance is negligible
(a) How long does it take the ball to reach the maximum height? (b) What is the maximum height reached by the ball? (c) What is its speed after 4.2 s? What will be an ideal response?
A nearsighted person has a far point that is 4.2 m from his eyes. What power contact lenses must he wear to allow him to focus on distant mountains?
A) 0.24 diopters B) -0.36 diopters C) -0.48 diopters D) -0.24 diopters E) 0.48 diopters
Our Sun will end its life in a planetary nebula and become a white dwarf
Indicate whether the statement is true or false
The potential energy for the formation of a hydrogen molecule can be approximated by U = -A + BR + C/R, where R is the nuclear separation. Given that A = -78.5 eV, B = 2.57 × 1011 eV/m , and C = 1.44 × 10-9 eV?m
At what nuclear separation is the potential energy a minimum? A) 1.9 × 10-11 m B) 3.7 × 10-10 m C) 7.5 × 10-11 m D) 2.9 × 10-11 m E) 5.1 × 10-10 m