(a) 1
Liquids are virtually incompressible.
2 Pressure is transmitted equally in
all directions throughout a liquid.
Both
of the properties have been expressed clearly and concisely. In the first
answer if the word ‘virtually’ had been omitted the mark would still have been
given. If you forget the word ‘incompressible’ you could say ‘cannot be
squashed’.
(b) 2 ´ 105 N 3
ome
of the data have been given in standard form. You can leave them like this and
give an answer in standard form or rewrite 8 ´ 106 as 8 000 000 and give the
answer as 200 000 N. However, for some questions, mainly those
involving very big or very small numbers, you should understand and be able to
use standard form.
(c) If the maximum weight were exceeded the
moments would no longer balance. The resultant moment would cause the crane to topple.
Although
it is not clear if it is the whole crane or just the jib that would topple, the
marks have been given for the idea that a resultant moment will cause something
to rotate.
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