Near the surface of the planet, the Earth's magnetic field is about 0.50 × 10^?4 T. How much energy is stored in 1.0 m3 of the atmosphere because of this field?
9.9 × 10^?4 J
You might also like to view...
A ________ is a region where jets of gas from young stars impact and heat the gas surrounding the young star.
A. bipolar outflow B. bok globule C. planetary nebula D. T Tauri star
A series circuit consists of a 0.55-H inductor with internal resistance of 8.0 ? connected in series with a 4.0-? resistor, an open switch, and an ideal 12-V battery
(a) When the switch is closed, what is the initial current through the 4.0-? resistor? (b) What is the current through the 4.0-? resistor a very long time after the switch is closed?
The impact of a 100-meter object will not cause "widespread" devastation, but it could still kill millions of people if it struck a major city. In Part C, you found that the probability of such an impact in any single year is only 1 in 1000. Suppose we learn that it has already been 1200 years since the last such impact. What would that tell us?
A. Nothing; we would still presume that the chance of such an impact during the next year is 1 in 1000. B. We are clearly due for such an impact, so the actual probability for the coming year must be much higher than 1 in 1000. C. We are overdue for the impact of a 100-meter object, so we should expect the impact of an even larger object during the next few years. D. There must be something wrong with the graph, because if the 1 in 1000 probability were correct, then there would have been an impact some time during the past 1000 years. Since there wasn't, the actual probability must be lower than 1 in 1000.
Two identical cars are traveling around the same curve on a highway. One of them is moving at 60 mph, and the other is moving at 30 mph. The centripetal force acting on the car moving at 60 mph is __________ the value of the centripetal force acting on the car moving at 30 mph
a. one quarter b. one half c. the same as d. twice e. four times