Is this correct? - problem relating to a pendulum

Question

Predict the time for 20 oscillations of a 1.0m long Pendulum on Planet U.

We know L = 1.0m g=6.91m/s²

T=2π N √L/g

T=2π (20) √1.0/6.91

= 150.18297

T = 150 seconds

If its correct than yay if not please tell me where I went wrong

Answer 1

If you take a square root, you should get the number 0.38. Then when you multiply it by 2, by π, and by 20 you will have 47.7 s.

I would do the problem like this:

Time of N = 20 oscillations

t = NT (1)

Period of the pendulum

T = 2π√ L /g (2)

Then plug in the numbers in equation (2), then in (1) to get 47.7 s.

Please use small "t" for total time. Do not use more then 3 significant digits.

Good luck!

When you use the calculator, do not forget to use parenthesis to follow order of operations.