Question

Sara has lived 18.0 years. How many seconds has she lived? Express the answer in scientific notation. Use 365.24 days per year for your calculations.

Answer 1

She has lived
`5.68021248* 10^8\ \text{seconds}`.

Explanation:

Given : Sara has lived 18.0 years.

To find : How many seconds has she lived?

Solution :

Using conversions,

1 year = 365.24 days

1 day = 24 hours

1 hour = 60 minutes

1 minute = 60 seconds

Converting 18 years into seconds,

`18 \text{years} = 18* 365.24* 24* 60* 60\ \text{seconds}`

`18 \text{years} =568021248\ \text{seconds}`

In scientific notation,

`18 \text{years} =5.68021248* 10^8\ \text{seconds}`

Therefore, she has lived
`5.68021248* 10^8\ \text{seconds}`.