Q079 - Physics For Engineers And Scientists - Solutions


Amateur Radio, Meteology and Astronomy website. JO10UX

Question 79 - Review - Chapter 1


On a sertain moment the longest officially verified human live span was attained by the Japanees man Shigechiyo Izumi, who died in 1986 at the age of 120 years and 237 days.


Express his live in seconds?

How many sifnificant figgures are there in your anwer and why?


One year is 365.24 days

One day is 24 60 60 seconds

In [1]:
# Calculations
years = 120
days = 237
total_days = 365.24 * years + days
total_seconds = total_days * 24 * 60 * 60
print(f'The man lived {total_seconds} sec')
The man lived 3807285120.000001 sec

As we do not know what time on his last day he passed away, so the uncertinity is one day or 24 60 60 sec

In [2]:
precision = 24 * 60 * 60
print(f'The uncertinity is {precision} sec')
The uncertinity is 86400 sec

So the number of significant figures is restricted to 5

In [3]:
print(f'The man lived {total_seconds:.4e} sec (scientific correct notation)')
The man lived 3.8073e+09 sec (scientific correct notation)

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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