A neutron in a nuclear reactor makes an elastic head-on collision with a carbon atom initially at rest. (The mass of the carbon atom is 12 times that of the neutron.) What fraction of the neutron's original kinetic energy is retained by the neutron?
a. 14.4%
c. 41.4%
b. 28.4%
d. 71.6%
D
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The concept of hydrostatic equilibrium is critical to understanding how the Sun has remained stable long enough for live to evolve here
Indicate whether the statement is true or false
The walls of cells are referred to by biologists as
A) linings B) coats C) shells D) membranes
Tectonic interaction between plate boundaries does not explain
A) magma production and the variety of igneous rocks. B) mountain building. C) polar wandering. D) global distribution of earthquakes and volcanoes.
The Sun is gradually increasing in luminosity as it ages. It is about 30% more luminous than it was when it was born. Why isn't this increase considered to be an explanation for global warming?
A) The Sun is increasing in luminosity way too slowly, over many millions of years. B) What the Sun was doing millions of years ago is what determines Earth's temperature, since the Earth doesn't respond directly to what the Sun is doing today. C) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does. D) The scientists are covering up this potentially valid explanation.