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Introduction Where does the word SURD come from? Around 820AD the famous Persian Mathematician al-Khwarizmi saw irrational numbers (namely numbers that cannot be written as fractions) as “inaudible numbers”. The LATIN for “inaudible” is “SURDUS” and so from this comes our use of the word SURD. We now use SURD for a number which we […]
Classwork Series and Exercises {Mathematics- SS2}: Surds Read More »
Numerous students, even journalists, writers and speakers, trust these words can be exchanged and won’t promptly trust they don’t mean the same, until they read this. ABBREVIATION (noun) 1. A shortened form of a word or phrase. (e.g. SKU is the abbreviation for Stock Keeping Unit) 2. The process of abbreviating something.
Grammar Clinic: The REAL difference between ABBREVIATION and ACRONYM Read More »
Radioactive Decay Introduction Radioactive decay is the spontaneous radioactive disintegration of an atomic nucleus, resulting in the release of energy. Some atoms are stable. Others are unstable and ‘decay’, emitting radiation to achieve a stable state. The emissions from an unstable atom’s nucleus, as it decays, can be in the form of alpha, beta or
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Formulae and Substitution A formula is an equation with letters which stands for quantities. For example C = 2πr Is the formula which gives the circumference, c, of a circle of radius r. In science, I = V/R Is the formula which shows the relationship between the current I amps, voltage, V volts, and resistance,
Classwork Series and Exercises {Mathematics- JSS3}: Formulae and Change of Subject Read More »
Definition: A ratio is a comparison of two similar quantities obtained by dividing one quantity by the other. Ratios are written with the : symbol. Example: The ratio of 6 to 3 is 6 ÷ 3 = 6/3 = 6 : 3 = 2 Example: The ratio of 3 to 6 is 3 ÷ 6
Classwork Series and Exercises {Mathematics- SS2}: Ratio, Proportion and Rates Read More »
Factors 40 ÷ 8 = 5 and 40 ÷ 5 = 8. We say that 8 and 5 are factors of 40. If we can divide a whole number by another whole number without remainder, the second number is a factor of the first. The numbers 1, 2, 4, 5, 8, 10, 20 and 40
Classwork Series and Exercises {Mathematics- JSS1}: Factors and Multiples Read More »
Coulombs Law The electric force between two point charges is directly proportional to the magnitude of each charge (q1, q2), inversely proportional to square of the separation between their centers (r), directed along the separation vector connecting their centers. This relationship is known as Coulomb’s Law. Charles Augustin de Coulomb (1736-1806) France. As an equation it
Classwork Series and Exercises {Physics- SS3}: Electric Field Read More »
Literature: Features of a Play Plays have the following features: The speakers’ names are printed in capitals at the beginning of their speech, with a colon following the name. E.g. DANIEL:, TOLU: e.t.c A play may also contain stage directions e.g. (Takes her hand.) These always appear in italics, and in brackets. E.g. DANIEL (He turns
Classwork Series and Exercises {English Language – JSS3}: How to Write a Play Read More »
ESTIMATION AND APPROXIMATION ROUNDING OFF To ’round off’ or ‘approximate’ a number to a desired degree of accuracy, we round the number up if the next digit is 5 or more or we round the number down if the next digit is less than 5. We represent approximately as ‘~’ Examples 73 is close to 70 if approximating to or rounding in “tens”.
Classwork Series and Exercises (Mathematics – JSS1): Estimation and Approximation Read More »
ALKENES An alkene also known as olefin is an unsaturated hydrocarbon containing at least one carbon-to-carbon double bond. The simplest alkenes, with only one double bond, no rings, and no other functional groups, are hydrocarbons with the general formula CnH2n. The first three are: Ethene C2H4 Propene C3H6 Butene C4H8 Laboratory Preparation of Ethene Dehydration of
Classwork Series and Exercises {Chemistry- SS3}: Unsaturated Hydrocarbon (Alkene) Read More »
