A wire lying in the plane of this page carries a current directly toward the top of the page
What is the direction of the magnetic force this current produces on an electron that is moving perpendicular to the page and outward from it on the left side of the wire? A) perpendicular to the page and towards you
B) perpendicular to the page and away from you
C) toward the top of the page
D) toward the bottom of the page
E) The force is zero.
E
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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.
The total number of comets orbiting the Sun is estimated to be about ________
A) 100,000 B) 1 trillion C) 1,000 D) 1 million
What spectral type of star that is still around formed longest ago?
A) O B) A C) F D) K E) M
When you draw the free-body diagram for a single object, you must sketch
1.the forces that act on the single object along with any resulting accelerations that the object experiences. 2.only the forces that act on the object. 3.the forces that act on the object and the forces that the object exerts on other objects. 4.only those forces that the single object exerts on other objects.