A juggler throws two balls up to the same height so that they pass each other halfway up when A is rising and B is descending. Ignore air resistance and buoyant forces. Which statement is true of the two balls at that point?
a. There is an residual upward force from the hand on each ball.
b. There is a greater residual force from the hand on A than there is on B.
c. Only gravity acts on B but there is an additional residual force from the hand on A.
d. There is an additional downwards force besides gravity on each ball.
e. The only force acting on each ball is the gravitational force.
E
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A window washer pulls herself upward using the bucket–pulley apparatus shown in the Fig.
(a) How hard must she pull downward to raise herself slowly at constant speed?
(b) If she increases this force by 15%, what will her acceleration be?
What is retrograde motion?
A. east to west motion of the Sun over many successive nights B. east to west motion of the Moon relative to the stars over many successive nights C. occasional west to east motion of the planets relative to the stars over many successive nights D. occasional east to west motion of the planets relative to the stars over many successive nights
A closed, sealed can of air placed on a hot stove. The contained air undergoes an increase in
A) mass. B) temperature. C) both of these D) neither of these
Two equal positive charges are near each other. If we increase the amount of charge on just one of them, then
A. the strength of the electrical force on both decreases. B. the electric field points toward the larger charge. C. the electric field at the position of the smaller charge increases. D. the larger charge feels a stronger electrical force and the other a weaker electrical force.