The effictive length of a simple pendulum is the sum of the following three : length of string , radius of bob , and length of hook.
In a simple pendulum experiment , the length of the string , as measured by a meter scale , is `92.0 cm`. The radius of the bob combined with the length of the hook , as measured by a vernier callipers , is `2.15 cm`. The effictive length of the pendulum is

Options

A. `94.1 cm`
B. `94.2 cm`
C. `94.15 cm`
D. `94 cm`

Answer

B

Explanation

`( 92.0 + 2.15) cm = 94.15 cm`. Rounding off to first decimal place , we get `94.2 cm`.