Chapter-2 Q003 - Physics For Engineers And Scientists - Solutions

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Question 3 - Problems - Chapter 2

Problem:

Glasiers sometimes advance 20m in one year

Question:

Express this speed in m/s and in cm/day

Solution:

Distance $s = 20m$

Time $t = 1year$

Average speed $v = \frac{s}{s}$ m / year

There are 3600 seconds x 24 hour x 365.24 days seconds in one year

There are 100 cm in 1 m

In [1]:
Distance = 20
Time_y = 1
Time = 1 * 3600 * 24 * 365.24
Speed = Distance / Time # in m per second
Speed_cm_d = (Speed * 100 * 3600 * 24)
# limit to 2 significant figures as distance is given in 2 significants too
print(f'The speed of the glasier is {Speed:.1e} m/s') 
print(f'Im cm per day is this {Speed_cm_d:.1f} cm/d')
The speed of the glasier is 6.3e-07 m/s
Im cm per day is this 5.5 cm/d

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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