Gravitational potential energy is equal to the ______________ of an object times its height
Fill in the blank(s) with correct word
weight, or milligrams
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________ occurs when most of the material collapsing to form a protostar has fallen into a disk around the star and a strong wind from the warm protostar ejects material from its poles
a. An emission nebula b. Hydrostatic equilibrium c. The proton-proton chain d. The thermonuclear fusion of hydrogen e. A bipolar outflow
Displacement: Which of the following quantities has units of a displacement? (There could be more than one correct choice.)
A. 32 ft/s2 vertically downward B. 40 km southwest C. 9.8 m/s2 D. -120 m/s E. 186,000 mi
An excited atom lost an electron from the atom to its surroundings
a. True b. False Indicate whether the statement is true or false
Force on a Moving Charge: A proton, moving west, enters a magnetic field. Because of this magnetic field the proton curves upward. We may conclude that the magnetic field must have a component
A. towards the west. B. towards the east. C. towards the south. D. towards the north. E. downward.