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How does respiration occur in living cells?

Glucose is broken down using oxygen. This releases energy from the bonds of glucose. The products are carbon dioxide and water.
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Answered by Nastia V. • Biology tutor
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When 0.81 m of a wire with cross-sectional area of 3.1*10^-11 m^2 is connected across a 2 V battery a current of 1.6 A flows in the wire. Find the resistivity of the material of the wire.

The resistance in the wire is given by the resistivity of the material by the lenght and divided by the cross-sectional area (R = p L/A). From here we can rearrange and have p = R A/L. However, we also know ...
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Answered by Viktoria B. • Physics tutor
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An electrical heater supplies 500J of heat energy to a copper cylinder of mass 32.4g Find the increase in temperature of the cylinder. (Specific heat capacity of copper = 385 J*kg^-1*Celsius^-1

The temperature of a body of mass m and specific heat capacity c rises by change in temperature (delta)T when an amount of heat Q is added to it (Q = m c (delta)T). From the equation we see that the change i...
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Answered by Viktoria B. • Physics tutor
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Solve the equation |3x + 4| = |3x - 11|

Here we have an equation involving absolute values. As a general rule |a| = +a and |a| = -a. We can apply that to our RHS. In the first case we get that 3x + 4 = 3x - 11, however after we subtract 3x from bo...
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Answered by Viktoria B. • Maths tutor
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Find the solutions to z^2 = i

Here z is a complex number, and therefore, z = a + b i. Thus, our equation becomes (a + b i)^2 = i. Expanding the brackets we get a^2 + 2 a b i + (b^2) (i^2) = i. Since i is the square root of -1, i^2 = the ...
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Answered by Viktoria B. • Maths tutor
37278 Views