Q075 - Physics For Engineers And Scientists - Solutions

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Question 75 - Review - Chapter 1

Problem:

An epoxy paint for painting a ship's hull must be applied with a distribution of 1 liter per 8 $m^2$

Question:

How thick is the layer of freshly applied paint?

Solution:

One Liter = $1 dm^3 = 10^{-3} m^3$

So we have to determine the height of a body with a surface of 8 $m^2$ and a volume of $1x10^{-3}m^3$

$height = \frac{volume}{surface}$

In [1]:
# Berekeningen
Volume = 1e-3
Surface_m2 = 8
Height = Volume / Surface_m2
print('The Height = Volume in m2 / Surface per m2')
print(f'    So: {Volume:.2g} / {Surface_m2:.2g} = {Height:5.5g} m of {Height*1e6:5.2f} µm')
The Height = Volume in m2 / Surface per m2
    So: 0.001 / 8 = 0.000125 m of 125.00 µm

سُوۡرَةُ حٰمٓ السجدة / فُصّلَت
ثُمَّ اسْتَوَىٰ إِلَى السَّمَاءِ وَهِيَ دُخَانٌ فَقَالَ لَهَا وَلِلْأَرْضِ ائْتِيَا طَوْعًا أَوْ كَرْهًا قَالَتَا أَتَيْنَا طَائِعِينَ ﴿١١
فَقَضَاهُنَّ سَبْعَ سَمَاوَاتٍ فِي يَوْمَيْنِ وَأَوْحَىٰ فِي كُلِّ سَمَاءٍ أَمْرَهَا ۚ وَزَيَّنَّا السَّمَاءَ الدُّنْيَا بِمَصَابِيحَ وَحِفْظًا ۚ ذَٰلِكَ تَقْدِيرُ الْعَزِيزِ الْعَلِيمِ ﴿١٢


Surah Fussilat: Thereafter turned He to the heaven and it was as smoke, and said Unto it and Unto the earth: come ye twain, willingly or loth. They said: we come willingly. (11) Then He decreed them as seven heavens in two days, and revealed Unto each heaven the command thereof; and We bedecked the nether heaven with lamps and placed therein a guard. That is the ordinance of the Mighty, the Knower. (12)

De hemelen en aarde (waren) een samenhangende massa. Wij hebben ze toen van elkaar gescheiden… Wij hebben de hemel tot een beschermend dak gemaakt … en de dag en de nacht, de zon en de maan geschapen. (Koran 41 11:12)


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