Home » Posts tagged 'length' (Page 2)
Tag Archives: length
Two thin lenses of focal lengths f1=20cm and f2=60cm are placed in contact. find the focal length f3 of the combined lenses. find also the focal length f of a third lens placed in contact with these two that would result in overall focal length f11=-40cm. (Asked Young)
A light year is the distance light travels in one year . How many meters are there in one light year?
The speed of light in vacuum is 3 x 10^8 m/s. That means in one second it travels 300000000 metres.
As we know, in one year, there are 365 days; in each day there are 4 hours; in each hour there are 60 minutes and in each minute there are 60 seconds.
Therefore, the distance traveled by light in one year = 3 x 10^8 x 365 x 24 x 60 x 60 = 1 light year = 9.4605284 × 1015 meters
Angana Asked: “What are the characteristics of a good balance?”
Ans: “There are two important characteristics of a good (true) balance.
- The two arms must be of equal length
- The two pans must be of equal weight.