What keeps the Sun's outer layers from continuing to fall inward in a gravitational collapse?
A) outward pressure due to hot gas
B) the strong force between protons
C) electromagnetic repulsion between protons
D) neutrinos produced by nuclear fusion drag gas outward.
A) outward pressure due to hot gas
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A U-238 nucleus (mass = 238 units) decays, transforming into an alpha particle (mass = 4.00 units) and a residual thorium nucleus (mass = 234 units). If the uranium nucleus was at rest, and the alpha particle has a speed of 1.50 × 10^7 m/s, determine the recoil speed of the thorium nucleus
For which of these forms of life is it hardest to apply present criteria for life, based on its behavior when isolated?
A) a bacterial spore B) a plant seed C) a virus D) a fungus spore E) a slime mold
What is one difference between alpha () and beta () radiation?
a. Alpha radiation is more easily stopped by an obstacle than beta radiation. b. Alpha radiation is less easily stopped by an obstacle than beta radiation. c. Alpha radiation is composed of protons and beta radiation consists of electrons. d. Beta radiation is negative, but alpha radiation is always neutral. e. Alpha radiation consists of waves and beta radiation is composed of particles.
What fraction of the solar system's mass is in the Sun?
a) About 50% b) About 99% c) About 10% d) Less than 1% e) About 75%