QUESTION 3
Describe two (2) differences for each of the following:
a) Physical and chemical changes.
b) Compounds and mixtures.
c) Group and period of the periodic table.
d) A weak acid and strong aeid basing on the alkaline metals
e) Alkall and alkaline metals.
QUESTION 4
a) Define simple machine.
b) A block and tackle consist of 4 pulleys in the upper block block. If used to lift 360 kg engine block of a tractor though Calculate:
i) The velocity ratio.
ii) The length of the bell that must be pulled through th
iii) The minimum effort required if the efficiency is \( 95 \% \) Describe three (3) effects of forces on bodies.
TION 5
tarts from rest and attains a speed of \( 40 \mathrm{~m} / \mathrm{s} \) in 20 sec Fonds and it is then brought to rest at a uniform rate
the velocity - time graph.
the graph, Calculate:
\[
r=u+a t
\]
The uniform acceleration.
he uniform retardation.
total displacement for the whole journe!