Diverging light rays from a nearby object (a few focal lengths away from the mirror) strike the surface of a concave mirror. After reflecting from the mirror's surface, the rays will converge at
a. the mirror's focal point.
b. a point beyond the mirror's focal point.
c. a point nearer than the mirror's focal point.
d. none of the above.
b
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Molecules are
A. subdivisions of atoms B. several atoms bound together C. the same as electrons D. the same as nuclei
A person walks in a distance x northward, turns around and walks a distance 7.00x southward. If the total displacement of the person from his starting position is 400 m south. What was the total distance walked?
A) 421 m B) 457 m C) 515 m D) 533 m E) 400 m
In an electrochemical cell, there is a tin electrode in a molar solution of Sn2+ ions and an iron electrode in a molar solution of Fe2+ ions.
(a) What reactions occur at the two electrodes? (b) What voltage is developed in the cell? (c) What is the Gibbs free energy change per mole of ions involved in the reaction?
A puck moves on a horizontal air table. It is attached to a string that gradually winds itself up around a round peg in the center of the table. This shortens the string, so the puck gradually spirals in towards the center
What happens to the magnitude of the puck's angular momentum?