In an RC circuit, how many time constants must elapse if an initially uncharged capacitor is to reach 80% of its final potential difference?
a. 2.2
b. 1.9
c. 1.6
d. 3.0
e. 5.0
c
You might also like to view...
A solar prominence is essentially
A. an aurora occurring in the Sun's atmosphere instead of Earth's. B. a plasma confined to a magnetic tube sticking out of the surface of the Sun. C. an eruption of gas heated by the sudden recombination of opposite polarity parts of the Sun's magnetic field. D. a cloud of hot gas lifting off the surface of the Sun.
If you feel a centrifugal force pulling you to the outside of a rotating circular wall:
a. you are correct about what is happening. b. the circular wall actually is pushing on you. c. you are experiencing a linear force. d. the centripetal force inward balances the centrifugal force outward, and you feel no net force. e. you are only experiencing half of what is happening; you are being pulled to the outside of the circle and the outside of the circle is also pushing on you.
What does the Moon's lack of a magnetic field suggest about its internal structure?
A. The Moon's interior has not differentiated. B. The Moon's crust is very thick and poor in iron. C. The Moon's core is smaller and cooler than Earth's. D. The Moon's mantle is too cold to form convection cells.
Imagine that you visit an alien world that has an atmospheric composition similar to that of Earth (that is, mostly nitrogen and oxygen) and a surface atmospheric pressure of 1.2 bars. Which of the following statements best describes the effects of this pressure?
a. It will feel quite similar to the atmospheric pressure on Earth. b. It will feel about like the pressure on a high mountaintop on Earth. c. It will feel crushing, like being deep under the ocean. d. It is so low that you'll need to wear a pressurized spacesuit to survive.