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Explain how Earthquakes Occur when Stress Stored in Rocks is Released.

Earthquakes occur when the stored stress in the rock exceeds its strength. Energy is released as the rocks fractures and moves in the form of seismic waves. The energy released causes vibrations creating gro...
AG
Answered by Arthur G. • Geology tutor
8696 Views

Differentiate with respect to x and write in its simpliest form, Y=(2x-3)/x^2?

Y=(2x-3)/x 2 Quotient Rule: dY/dx(u/v)=(u'v-v'u)/v 2 dY/dx=(2x 2 -2x(2x-3))/x 4 =(6x-2x 2 )/x 4 (Collect numerator x terms.) =(6-2x)/x 3 (Cancel the fraction by a factor of x.) dY/dx=(6-2x)/x 3
JD
Answered by Joe D. • Maths tutor
7182 Views

[FP2] Solve: 3 cosh x - 4 sinh x = 7

First write cosh and sinh as exponentials, from their respective definitions:sinh x = 1/2 (e x - e -x )cosh x = 1/2 (e x + e -x ​)So: 3 * 1/2 (e x + e -x ​) - 4 * 1/2 (e x - e -x ) = 7Multiply by 2: 3 * (e x...
WU
Answered by William U. • Maths tutor
22081 Views

What is the difference between "ser" and "estar"?

This is a tricky one. The rhyme I learned "how you feel and where you are - that is when you use estar!" is pretty useful, but I like to remember it based on whether the state of something can chan...
SL
Answered by Sophie L. • Spanish tutor
2439 Views

How do I structure my essay?

I always followed a very simple structure which appeared to work very well; the introduction would include two opposing historical views (quotes from historians to support them are great but not essential), ...
MW
Answered by Molly W. • History tutor
4584 Views