# who are good in physics here??? pls help me

By lonely_f16

@lonely_f16 (2147)

Philippines

July 9, 2007 6:03am CST

Problem solving: The equation for calculating the relativistic mass of a moving object is m=Me over square root of 1-(Ve squared/C sqaured) where m is the relativistic mass of the object, Me is the rest mass of the electron, Ve is the Velocity of the electron, and c is the speed of the light. Calculate the relativistic mass to rest mass ration, for an electron which has a velocity with respect to the observer that is 20 % of the velocity of the light...thanks!

1 response

@hoVla5 (5)

• Croatia (Hrvatska)

11 Jul 07

The equation you wrote is all you need to solve this. You want to calculate:
m/Me=1/sqrt(1-(Ve/C)^2)
You said that velocity of object is 20% of velocity of light, so Ve/C=0.2 = (Ve/C)^2=0.04, and solution is:
m/Me=1/sqrt(0.96)
sqrt means square root.
I hope this helps. If you have more questions, just ask! :-)