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What triggers an earthquake at a tectonic plate margin?

Earthquakes are caused by the release of tension that builds up at plate margins. They can be triggered at destructive, constructive and conservative boundaries. At destructive margins, tension builds up as ...
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Answered by Charlie W. • Geography tutor
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What is the difference between a polar molecule and a non-polar molecule? Can non-polar molecules be formed by polar atoms?

Polar molecules are those that have permanent dipoles. A permanent dipole occurs due to a difference in the electronegativity of the atoms involved in the bond. You might not be familiar with the term ´elect...
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Answered by Adrian G. • Chemistry tutor
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Factorise this formula completely 2kx + 6ky + 4kz

2kx + 6ky + 4kz =2k (x + 3y + 2z)
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Answered by Samah K. • Maths tutor
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Solve algebraically 6a + b = 16 & 5a - 2b = 19

6a + b = 16 Equation 1 5a - 2b = 19 Equation 2 Scale up one equation so both equations have same coeffient of one variable ie 2 times Equ 1 12a + 2b = 32 5a - 2b = 19 Add variables of each equation, hence el...
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Answered by Euan M. • Maths tutor
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If a 30N force is applied to a stationary object of mass 10kg, at what speed will the object accelerate?

By taking the formula F=m*a, and rearranging the make a the subject, we get a=F/m. Then by substituting in the values given we can work out that a=30/10=3. The units of acceleration are ms -2 so hence, the o...
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Answered by Chris M. • Physics tutor
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