The strong force is the force that
a. binds electrons to the nucleus in an atom.
b. holds the Moon in orbit around Earth.
c. creates the magnetic field associated with sunspots.
d. produces the extremely high temperatures in the solar corona.
e. binds protons and neutrons together to form a nucleus.
e
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What do we mean by a geocentric model of the universe?
A) a model of the Milky Way Galaxy that has our solar system located at its center B) a model designed to explain what we see in the sky while having the Earth orbit the Sun C) the name given to sphere-shaped models that show all the constellations as they appear in our sky on the celestial sphere D) a model designed to explain what we see in the sky while having the Earth located in the center of the universe
Two nonparallel vectors determine a plane. Relative to the plane determined by the position vector where the force is applied and the force vector, in which direction is the torque vector about the origin?
A) perpendicular to the plane B) in the plane, but perpendicular to both the position vector and the velocity vector C) in the plane, but perpendicular to the velocity vector D) in a direction dependent on the magnitudes of the velocity and position vectors E) in the plane, but perpendicular to the position vector
In ________ stars most of the electrons in the hydrogen atom are above level 2 and in ________ stars most of the electrons are below level 2, therefore the ________ are essentially absent in both types.
A. type O; type A; emission lines B. type M; type A; absorption lines C. type A; type M; emission lines D. type M; type O; Balmer lines E. type O; type M; Balmer lines
A box is placed on a table which rests on the floor. The box pushes on the table; the Newton's third law pair to the the box's push on the table is the table's push on the floor
A) True B) False