A proton is accelerated from rest through a potential difference of 150 V. It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm). What is the magnitude of the magnetic field in this region?
a. 18 mT
b. 12 mT
c. 15 mT
d. 22 mT
e. 10 mT
c
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The dark area stretching from the center of this picture to the upper right is about 50 light-years long and lies in the plane of the Milky Way Galaxy. What is it?
A) a star-forming cloud B) a region of the galactic plane in which there are few stars C) the expanding remains of a supernova D) a black hole
The belts of Jupiter are best described as :
A) regions of downward moving material and low pressure. B) regions of upward moving material and low pressure. C) regions of upward moving material and high pressure. D) regions of downward moving material and high pressure. E) turbulent regions with no organized circulation pattern.
The best description of the multidimensional integrative approach to understanding psychopathology is that it's based on
What will be an ideal response?
The impact of a 100 meter asteroid could kill many people if it struck a major city. Suppose the probability of such an impact in any single year is 1 in 1,000, and suppose we know (somehow) that it has been 1200 years since the last impact
What would that tell us? A) The prediction must be wrong, since the time since the last impact has been 1200 years. B) Nothing, we would still presume that the chance of such an impact during the next year is 1 in 1000. C) We are overdue for such an impact, so we should expect to be hit by something even larger during the next few years. D) We are now due for such an impact, so the actual probability for the coming year must be much higher than 1 in 1000.