EBK PHYSICS FOR SCIENTISTS AND ENGINEER
9th Edition
ISBN: 8220100461262
Author: SERWAY
Publisher: Cengage Learning US
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Textbook Question
Chapter 2, Problem 2.10P
Review. The North American and European plates of the Earth’s crust are drifting apart with a relative speed of about 25 mm/yr. Take the speed as constant and find when the rift between them started to open, to reach a current width of 2.9 ×103 mi.
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The Richter Scale is used for measuring the magnitude of earthquakes. the magnitude of an earthquake is, by deifnition, measured 100 kilometers from its originating point, and is given by the equation M = log(s/10^-4), where S is the "strength" of the earthquake, as determined by the shockwaves it sends through the ground. Earthquake strengths vary greatly from 0 in some cases to 800,000,000 or more in other cases which is why a logarithmic scale is used to measure their magnitudes.
(I already know Part A)
Part B
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The largest manmade explosion was the test detonation of the Tsar Bomba hydrogen bomb. It was equivalent to about 50 million tons of TNT. It was similar in intensity to a magnitude 8.5 earthquake. The stronger earthquake ever recorded was the 1960 Valdivia earthquake than the Tsar Bomba? How much TNT was the earthquake equivalent to? Show…
The Richter Scale is used for measuring the magnitude of earthquakes. the magnitude of an earthquake is, by deifnition, measured 100 kilometers from its originating point, and is given by the equation M = log(s/10^-4), where S is the "strength" of the earthquake, as determined by the shockwaves it sends through the ground. Earthquake strengths vary greatly from 0 in some cases to 800,000,000 or more in other cases which is why a logarithmic scale is used to measure their magnitudes.
Part A
One of the strongest earthquakes ever recorded had a magnitude of 8.9 on the Richter Scale.
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ii) What would be the magnitude of an earthquake four times weaker than this one?
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Part B
Suppose a given earthquake is twice as strong as another earthquake. Determine the difference in magnitude of these earthquakes.
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The largest…
The figure shows, not to scale, a cross section through the interior of Earth. Rather than
being uniform throughout, Earth is divided into three zones: an outer crust, a mantle, and an
inner core. The dimensions of these zones and the masses contained within them are shown
on the figure. Earth has a total mass of 5.98 x 1024 kg and a radius of 6370 km. Ignore
rotation and assume that Earth is spherical. (a) Calculate ag at the surface. (b) Suppose that a
bore hole (the Mohole) is driven to the crust-mantle interface at a depth of 25.0 km; what
would be the value of ag at the bottom of the hole? (c) Suppose that Earth were a uniform
sphere with the same total mass and size. What would be the value of ag at a depth of 25.0
km? (Precise measurements of ag are sensitive probes of the interior structure of Earth,
although results can be clouded by local variations in mass distribution.)
6345 km
(a) Number
(b) Number
25 km
Number i
3490 km
-Core, 1.93 x 1024 kg
Mantle, 4.01 × 1024 kg
Crust,…
Chapter 2 Solutions
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
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