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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When two or more resistors are connected in parallel to a battery
A) the voltage across each resistor is the same. B) the total current flowing from the battery equals the sum of the currents flowing through each resistor. C) the equivalent resistance of the combination is less than the resistance of any one of the resistors. D) all of the other choices are true.
RC Circuits: For the circuit shown in the figure, V = 60 V, C = 20 µF, R = 0.10 M?, and the battery is ideal. Initially the switch S is open and the capacitor is uncharged. The switch is then closed at time t = 0.00 s. What is the charge on the capacitor 8.0 s after closing the switch?
A. 1200 µC B. 940 µC C. 1400 µC D. 1600 µC E. 1900 µC
Which of the identical light bulb(s) is(are) brightest when the capacitor has half its maximum charge?
a.
A
b.
B
c.
C
d.
A and B
e.
All three are equally bright.
What is a meteor?
A. the object that causes a "shooting star," but before it passes through the atmosphere B. any one of the large rocky bodies that orbit the Sun, primarily between Jupiter and Saturn C. a space rock that survives its fall through Earth's atmosphere and reaches the ground D. a glowing trail of hot gas and debris heated by friction as an object moves through the atmosphere