A. 156900 s

B. 172800 s

C. 177800 s

D. 160000 s

Here we’re going to find out the answers using unit factor method or dimensional analysis, or sometime may refer as factor label method.

As we know from our chemistry book that the method of converting units from one system to another system is know as dimensional analysis. It is something to we come across everyday, for example measuring the height of the table we need to have it either in cm or inch scales.

Therefore there is need of converting one measuring unit to another to obtain precise measurement.

Now let’s talk about question and let’s try to find out using dimensional analysis.

As we already know 1 day = 24 hours ( h)

The above can be written in unit as 1 day / 24 hour = 1 = 24 hours / 1 day

We also need to find the hours becuase here we’re finding out days in seconds

then 1 hour (h) = 60 Minutes (min)

Likewise it can also be written as 1 h/ 60 min = 1 = 60 min / 1 h

Finally we need to convert 2 days in seconds, to do that we need to multiply unit factor in one series as written below:

2 day × 24 h / 1 day × 60 min / 1 h × 60s / 1 min

The above equation can be written as 2 × 24 × 60 × 60 s

By multiplying the we get the answer: 172800 s

Therefore there are 172800s in 2 days.

Test your learning with this question: How many seconds are there in 5 days?