Chapter-2 Q011 - Physics For Engineers And Scientists - Solutions

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Question 11 - Problems - Chapter 2

Problem:

The surface of the Earth consists of several large plates which move relative to each other. The Pacific plate (which include a slice of the continental Nord American plate at a speed of 4.0 cm per year.

Question:

a) How long dous it take for this plate to move 1 km?

b) How long dous it take to move $1.0x10^3$ km?

Solution:

Distance $s = 1$ km

Average speed $v = 4.0$ cm/year

Time $t = s * v$ hours

In [1]:
Distance = 1 *1000 * 100 # in cm
Avg_Speed = 4 # cm/Year
Time = Distance / Avg_Speed
print(f'It takes {Time:.1e} Years to shift 1 km.')
print(f'It takes {Time * 1000:.1e} Years to shift 1000 km.')
It takes 2.5e+04 Years to shift 1 km.
It takes 2.5e+07 Years to shift 1000 km.

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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