Correct Answer: D. electron affinity

Correct Answer: A. antigens are absent in thier blood cells

Correct Answer: A. cash and trade debtors

Correct Answer: A. An industrial product

Correct Answer: c. Incubation

Correct Answer: B. sandy loam

Explanation

(a) \(m=2kg;u=(3i+2j)ms^{-1};v=(15i-4j)ms^{-1};t=4s;a=?\)

\(a=\frac{v - u}{t}=\frac{(15i - 4j) - (3i + 2j)}{4}\)

\(a=\frac{15i - 4j - 3i - 2j}{4}=\frac{12i - 6j}{4}\)

\(∴a=3i-\frac{3}{2}j ms^{-2}\)

(b) \(m=2kg;a=3i-\frac{3}{2} j\)

\(F=ma=2(3i-\frac{3}{2}j)\)

F = 6i - 3j

\(|F| = √(6^2 + (-3)^2)\)

\(|F| = √(36 + 9) = √45\)

\(∴ |F| = 3√5 N = 6.71 N\)

(c) \(u=3i+2jms^{-1};a=3i-\frac{3}{2}j ms^{-2};t=8s\)

v = u + at

\(v=(3i+2j)+8(3i-\frac{3}{2} j)\)

\(v = 3i + 2j + 24i - 12j\)

\(v = 27i - 10j\)

\(|v| = √(27^2 + (-10)^2)\)

\(|v| = √(729 + 100) = √829\)

\(∴ |v| = 28.792 ms^{-1} (to 3d.p)\)

Explanation

(a) Money is any commodity which is generally acceptable in payment for goods and services and for the settlement of debts.

(b)(i)Portability: - money should be easily carried from one place to the other

(ii)Homogeneity:- money must be the same size, weight and colour.

(iii)Acceptability:- money must be generally acceptable.

(iv)Recognisability/cognisability:- money should be easily recognised by the people.

(v)Relatively scarce:- Money should be relatively scarce i.e. it must be limited in supply.

(vi)Durability:- the material used as money must be able to last long.

(vii)Stability:- the value of money must be relatively stable over a period of time.

(viii)Intrinsic value:- the material used as money must not have value higher than the face value of money.

(ix)Divisibility:- money must be capable of being divided into smaller units.

(c)(i)As a measure of value/unit of account:- During inflation, prices rise rapidly so money loses value. Therefore money ceases to be a good measure of value as its value becomes unstable.

(ii)As a standard for deferred payments: - Goods sold on credit are paid for in future with money. During inflation, this function is affected as money loses value with time. Credit sales are discouraged.

(iii)As a store of value: - During inflation, money stored or kept now will lose value in future. So people prefer to store their wealth in other forms.

(iv)As a medium of exchange:-During inflation, money loses its value. People lose confidence in money and may prefer other commodities as medium of exchange.

Correct Answer: C. 1976

Correct Answer: A. Sequence of events