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
Answer: A
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A sealed hot air balloon is capable of rising to high altitudes when it is initially released. As the air in the balloon cools, however, it eventually comes back down to the ground because
A. objects can only float in a fluid if their density is less than that of the fluid. B. what goes up must come down. C. objects heavier than air can only fly through the air with the help of a motor. D. the object comes down when the air in it eventually leaks out.
Meteoric material dates the formation of the solar system at about ________ billion years
A) 1.5 B) 2.0 C) 2.5 D) 4.6 E) 10
Why are planets and stars approximately spherical, whereas asteroids and meteorites are shaped like ordinary rocks?
What will be an ideal response?
Compared with the buoyant force of the atmosphere on a 1-kg helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-kg solid wood block is
A) considerably less. B) considerably more. C) the same.