In both fission and fusion, mass
A) is created from energy of other forms.
B) converts to kinetic energy.
C) converts to gamma radiation.
D) remains the same.
Answer: B
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A) magnetism B) gravitation C) the strong force D) radiation pressure E) electron degeneration pressure
What produces the lunar phases?
a. The rotation of the Moon b. The revolution of the Moon c. The changing direction of sunlight d. Earth's tilted axis relative to the Moon e. The changing direction of Earth to the Moon
The Sun is gradually increasing in luminosity as it ages. It is 20% more luminous than it was when it was born. Why isn't this considered to be an explanation for global warming?
A) The scientists are covering up this potentially valid explanation. B) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does. C) The Sun is increasing in luminosity much too slowly, over many millions of years. D) 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.
Two equal forces are applied to a door. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts the greater torque?
A) the first at the midpoint B) the second at the doorknob C) both exert equal non-zero torques D) both exert zero torques E) additional information is needed