upper and lower bounds ( PLEASE HELP ASAP)

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malaikax04
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#1
Report Thread starter 10 months ago
#1
so i dont know what steps im missing but im only getting 3/5 marks so could someone please tell me the missing steps :
THE QUESTION
a rectangular floor tile is shown
its dimensions are given to the nearest 0.1 meters
width = 2.3m
length = 1.6m
the tile is only able to sustain a maximum pressure of 200 newtons per square meter (N/ m squared)
correct to the nearest 5 N/ m squared
given that pressure = force /area
work out the MAXIMUM force in newtons that can SAFELY be applied to the tile

MY WORKING OUT THAT HAS 3/5 MARKS
area
1.65 × 2.35 = 3.88
1.55 × 2.25 = 3.49
2.25 x 1.65 =3.71
1.55 x 2.35 = 3.64
pressure
upper bound = 202.5
lower bound = 197.5

SOMEONE PLEASE TELL ME WHAT IM MISSING
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mqb2766
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#2
Report 10 months ago
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(Original post by malaikax04)
so i dont know what steps im missing but im only getting 3/5 marks so could someone please tell me the missing steps :
THE QUESTION
a rectangular floor tile is shown
its dimensions are given to the nearest 0.1 meters
width = 2.3m
length = 1.6m
the tile is only able to sustain a maximum pressure of 200 newtons per square meter (N/ m squared)
correct to the nearest 5 N/ m squared
given that pressure = force /area
work out the MAXIMUM force in newtons that can SAFELY be applied to the tile

MY WORKING OUT THAT HAS 3/5 MARKS
area
1.65 × 2.35 = 3.88
1.55 × 2.25 = 3.49
2.25 x 1.65 =3.71
1.55 x 2.35 = 3.64
pressure
upper bound = 202.5
lower bound = 197.5

SOMEONE PLEASE TELL ME WHAT IM MISSING
So what is the maximum force that can be safely applied?
Generally, its better to think about whether you want max or min area and pressure before you start the problem?
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wilts
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Report 10 months ago
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Firstly think about which bounds are critical for the tile not to break.
Secondly, re-read the final part of the question (hint, the tile isn't 1 M square)
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