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Which intermolecular forces do I need to know about and how do they differ in strength?

The intermolecular forces you will need to know about are induced dipole-dipole, permanent dipole-dipole, and hydrogen bonding. Induced dipole-dipole interactions occur when there is only a small or no diffe...
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Answered by Tilly R. • Chemistry tutor
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Solve x for (x)/(4x-1) = (6x+5)/(12x+31)

First, we must cross multiply to remove the fractions, to do this, we multiply each numerator by the opposite denominator: (x)(12x+31) = (6x+5)(4x-1) . Then, we multiply out the brackets to get: 12x 2 + 31x ...
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Answered by Elsie I. • Maths tutor
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What is the difference between a for loop and a while loop?

A for loop will run the code a predetermined number of times, whereas a while loop will continue to execute the code until a predetermined condition is met.
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Answered by Molly I. • Python tutor
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The quadratic equation (k+1)x^2 + (5k - 3)x + 3k = 0 has equal roots. Find the possible values of k

We know the discriminant (b^2 - 4ac) must be equal to zero for an equation to have equal roots (think about the fact that the square root of this is taken in the quadratic equation). So we can form the equat...
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Answered by Molly I. • Maths tutor
7247 Views

Particles P and Q move in a plane with constant velocities. At time t = 0 the position vectors of P and Q, relative to a fixed point O in the plane, are (16i - 12j) m and -5i + 4j) m respectively. The velocity of P is (i + 2j) m/s and the velocity of Q

is (2i + j) m/s. Find the shortest distance between P and Q in the subsequent motion. This is an m4 question from the edexcel June 2015 paper. First I would explain to the student that I would form an equati...
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