Why did the big bang only create hydrogen, helium, and trace amounts of lithium?
What will be an ideal response?
Atoms with an atomic weight of 5 or 8 are unstable. Lithium can have weights of 6 or 7 . Nuclei with atomic weights of 5 and 8 are radioactive and decay almost instantly back into smaller nuclei. Therefore, it is hard to jump from helium (4) to Lithium (6) without having a stable atom with a weight of 5 . It is virtually impossible to jump from lithium-7 to higher elements without a stable element at 8.
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In the outer regions of the solar nebula where temperatures were low,
A) only rock and iron could condense B) only hydrogen compounds could condense as ices C) hydrogen and helium gases were able to condense D) in addition to rock and iron, hydrogen compounds also condensed as ices
By how many newtons does the weight of a 100-kg person change when he goes from sea level to an altitude of 5.0 km if we neglect the earth's rotational effects? (The mean radius of the Earth is 6.38 × 106 m, G = 6.67 × 10-11 N ? m2/kg2.)
A) -0.60 N B) -1.5 N C) -2.6 N D) -3.6 N E) -5.2 N
An uncharged, series RC circuit is connected across a battery. For which situation will the time for the capacitor to reach 90% of its final charge remain unchanged? a. The RC time constant is doubled
b. The battery voltage is doubled. c. A second resistor is added in series with the original resistor. d. All of these situations result in the time for the capacitor to reach 90% of its final charge to change.
Terrence goes for a walk. He walks 2.0 km north, then turns and walks 4.0 km south of east. What is his displacement vector? Take east to be in the +-direction and north to be in the +-direction.
a. (2.0 + 4.0 ) km b. (2.8 – 0.8 ) km c. (4.8 + 5.7 ) km d. (5.7 – 2.8 ) km