Simple practice questions to get accustomed to significant numbers. This is important for all sciences. Attachments in PDF format.

Answer the following questions. The answer is to be given to the appropriate significant figures. a) 2.6 x 10 ^5 m + 2.1 x 10 ^ 3 km b) The volume of the moon is 2.21x10^19 m2. What is the radius? c) If there are 100 000 eletronic components on a semiconductor chip that measures 5.0 nm by 5.0 nm      i) How much ...continues

Simple practice questions to get accustomed to significant numbers. This is important for all sciences. Attachments in PDF format.

A 3.6 cm long radio antenna is added to the front of an aeroplane 41 m long. What is the overall length? Repeat this problem with an aeroplane length of 41.05 m. The answer must be to the correct significant figures. Full details are in the attachment below.

Simple practice questions to get accustomed to significant numbers and ensuring that numbers are not rounded too quickly. Attachments in PDF format.

a) "Machine epsilon" is a computer term describing the minimum quantity that can be added to 1 to give a different number. If machine epsilon for a certain computer is 0.000001, roughly how many significant figures does the computer carry in it's calculations? b) To see that it is important to carry more digits in intermedi ...continues

Practice question to get accustomed to significant numbers. Attachments in PDF format.

The answer should not contain more significant figure than the question. A carbon dioxide molecule contains a carbon atom and two oxygen atoms. Calculate its mass in: a) atomic mass units b)kilograms. (Amu of carbon = 14, Amu of oxygen = 16) See attachment below.

Steady-state temperature and relfectivity using thermal radiation. Solution in JPG format.

Consider venetian blinds that are painted black on one side and white on the other. Assume that the blinds are installed between two panes of glass, with a vacuum inbetween so that air and its convection have no effect on the problem. Assume that the reflectivity of the white side is 90% and that of the black side is 10%. How we ...continues

Proving the work unit is equal to pressure* volume. Converting cm*mL to Joules. Solution in JPG format.

Verify that the units of pressure*volume are work units, and calculate the conversion from cmH2O*mL to Joules.

Determining the cardiac output using Fick's method, concentrations and rates. Solution in JPG format.

Find the cardiac output of a heart using Fick's method given that the concentration of oxygen in the pulmonary artery is 14mL/100 mL (Cin) and in the vein is 20 mL/100 mL (Cout). Oxygen uptake (U) by the lungs is 300 mL/min. Assume that blood flows at a constant rate Q mL/min (the cardiac output).

Calculation of rate of appearance of glycerol given the impulse response function.

The impulse response function for the concentration of a labelled glycerol in a dog following an injection of m0 grams is given very closely by: C=0, t<0.25 min C=A*t^-1.2, t>=0.25 min Find an expression for the rate of appearance of glycerol, Ra, in the dog.

Estimation of diffusion coefficient using Fick's law. Solution in JPG format.

Estimate the diffusion coefficient, D, of skin, given that 350 mL of water diffuses through the skin each day, that the surface of the skin is 1.73 m2, and that the skin is 20 um thick. Assume that there is pure water inside the skin.

Finding the magnitude and direction of the resultant in vector algebra.

Two vectors having equal magnitudes (A) makes an angle z with each other. Find the magnitude and direction of the resultant and prove that the resultant of two equal vectors bisects the angle between them.