Question 7 - Problems - Chapter 2¶

Problem:¶

On one occasion a tidal wave (tsunami) originating near Java (Jakarta) was detected in the English Channel 32 hours later

Question:¶

Roughly measure the distance from Java to England by sea (around the Cape of Good Hope) on a map of the world, and calculate the average speed of the tidal wave.

Solution:¶

You can measure rouchly the distance on this link

Distance Jakarta to Londen

Distance $s = 34000$ km

Time $t = 32$ hours

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

In [1]:

import numpy as np
Distance = 34000
Time = 32
Average_speed = Distance / Time
# limit to 2 significant figures as distance is given in 2 significants too
print(f'The average speed in km per hour is {Average_speed:.0f} km/h.')

The average speed in km per hour is 1062 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)