8
3.0
2.8
2.6
2.4
2.2
2.0
1.8
70
80
90
100
drop height (metres)
shell length (millimetres)
wet beach
sand
rock
Figure 4 Relationship between Minimum Drop Height and Length of Black Mussel Shells which
fractured when dropped onto rock or wet beach sand
14
Which one of the following is the smallest drop height required to fracture three black mussels with
lengths 75 millimetres, 85 millimetres, and 100 millimetres, when all three are dropped onto wet beach
sand?
A
1.90 metres
C
2.67 metres
B
2.35 metres
D
3.00 metres
15
An 80 gram black mussel has a shell area closest to
A
20 square centimetres.
C
40 square centimetres.
B
24 square centimetres.
D
45 square centimetres.
16
Two black mussels are dropped from a height of 2.5 metres onto wet beach sand. Black mussel
X
has a
mass of 30 grams and black mussel
Y
has a mass of 60 grams.
According to the available evidence,
A
only black mussel X will fracture.
B
only black mussel Y will fracture.
C
both black mussels will fracture.
D
neither black mussel will fracture.
