Chapter-2 Q005 - Physics For Engineers And Scientists - Solutions

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Question 5 - Problems - Chapter 2

Problem:

In 1958 the nuclear-powered submarine Nautilus took 6 days and 12 hours to travel submerged 5068 km across the Atlantic from Portland, England, to New York City.

Question:

What was the average speed (in km/h) for this trip?

Solution:

Distance $s = 5068 km$

Time $t = 6 days and 12 hours$

Average speed $v = \frac{s}{t}$ km/h

In [1]:
Distance = 5068 # in km
Time_h = 6 * 24 + 12
Speed_km_h = Distance / Time_h # in km/h
# limit to 2 significant figures as distance is given in 2 significants too
print(f'The average speed for this passage is {Speed_km_h:.1f} km/h') 
The average speed for this passage is 32.5 km/h

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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