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A geometric progression has first term 3 and second term -6. State the value of the common ratio.

3/-6 = -2
EH
Answered by Elizabeth H. • Maths tutor
6529 Views

State one property that all EM waves have in common.

All EM waves travel at the same speed in a vacuum.
EH
Answered by Elizabeth H. • Physics tutor
3056 Views

Explain what is meant by the term "plastic deformation".

Plastic deformation happens to a material when that material is stretched beyond its elastic limit and hence won't return to its original shape. Therefore the material is permenantly mis-shaped.
EH
Answered by Elizabeth H. • Physics tutor
11487 Views

The probability distribution of the random variable X is given by the formula P(X = x) = 0.09+0.01x^2 for x= 1,2,3,4,5 ). Find E(X).

The expected value of a discrete variable is defined as: E(X) = ∑x*P(X=x) (for all possible values of x, in this case x = {1,2,3,4,5} ) (next, we will expand the summation and substitute in the values given,...
RH
Answered by Robin H. • Maths tutor
8038 Views

A group 2 metal, M, is reacted with water so that M + 2H2O --> M(OH)2 + H2. 0.162g of metal produces 97.0cm3 of gas at RTP. Identify M.

1 mole of gas is produces for 1 mole of metal used. n (moles) = volume/24000 ---- This is because 1 mole of a gas occupies 24000cm3 of space, so it's a simple ratio to work out moles(H2). = 97/24000 = 0.0040...
CS
Answered by Cory S. • Chemistry tutor
16842 Views