# How do you work out equations with powers in Physics?

Can't do them at all!! Help please!

Posted Sun 13th January, 2013 @ 17:50 by Crystal Blue ♥

Powers are just telling you how many times you multiply the number by 10. You just have to type them into your calculator as you see them when working out equations. They are just shortened numbers which makes them easier to write and use in calculations.

I hope this helps.

http://library.thinkquest.org/20991/alg/powers.html

http://www.bbc.co.uk/schools/gcsebitesize/maths/number/powersrootshirev1.shtml

Answered Sun 13th January, 2013 @ 18:37 by Tilly - Team GR

I understand what powersa are and stuff its just the equations, for example:

Electromagnetic waves travel at a speed of 3.0 x 10 (to the power of 8) m/s. A radio station transmits waves with a wavelength of 2.5 x 10 (squared) m.

Calculate the frequency of the radio waves.

The equation is:

v = f × λ

Speed - Frequency x Wavelength

But thank you for answering anyway Tilly :)

UPDATE:

The answer is 1.2 x 10 (to the power of 6) / 1200000

But I just don't know how I can work it out, and Ive found that this question always pops up in an exam :(

Answered Mon 14th January, 2013 @ 17:12 by Crystal Blue ♥
Edited by Crystal Blue ♥ on Mon 14th January, 2013 @ 17:17

Help anyone? :o(

Answered Tue 15th January, 2013 @ 18:08 by Crystal Blue ♥

Hii  for your question  you put V = F x  λ in a formula triangle

and then it should be F=  velocity/wavelength

so it's 3.0x 10 (to the power of 8) divided by 2.5x10 (squared) which equals  1200000

Answered Wed 16th January, 2013 @ 17:44 by maya

Yes, you just re-arrange the equation.

Answered Wed 16th January, 2013 @ 17:53 by Amnah Anjum

Thank you I understand now :)

Answered Sun 20th January, 2013 @ 11:39 by Crystal Blue ♥