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y is inversely proportion to the square of x. y=10 when x=5. Express y in terms of x.

y is proportion to 1/x2. This can be written as y=k/x2 where k is a constant of proportionality. Given that y=10 when x=5, k can...

EH
Answered by Evan H. • Maths tutor
36910 Views

A heater uses energy from a laptop computer to keep a mug of coffee hot. Energy is transferred to the coffee at the bottom of the mug. Explain how a convection current is set up in the coffee.

The molecules at the bottom of the mug gain energy and spread out as a result. This means that these molecules are less dense than the ones above them so they rise upwards. As they do so, they lose energy...

EH
Answered by Evan H. • Physics tutor
4744 Views

How would one multiply out brackets?

If asked to multiply out a set of brackets, one must remember to multiply each term in a set of brackets by every term in the other set of brackets. For example, (x+2)(x-4) = x2+2x-4x-8 = x

AR
Answered by Alden R. • Maths tutor
4590 Views

A right-angled triangle has an angle of 30 degrees and its hypotenuse has a length of 9cm. Find the length of either of the triangle's other two sides.

Please note that this solution is easier to explain with 2 diagrams 

The side opposite of the 30 degree angle: 

If we have the hypotenuse and require the length of the opposite side then we ...

CB
Answered by Ciaran B. • Maths tutor
4954 Views

Describe how information passes across a synapse.

A chemical called a neurotransmitter passes from one neurone to the next causing an electrical impulse.

JH
Answered by Jordan H. • Biology tutor
6193 Views

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