# Time dilation equation help

1. Jan 29, 2006

### crazynut52

I have the attached equation
but when I plug it, I dont get the same answer as in the back of the book...

Here is the question

Two observers, A on earth, B in a spacecraft whose speed is 2.0X10^8 m/s both set their watches to the same time, when the ship is abreast the earth.

How much time must elapse by A's reckoning before the watches differ by 1.00 seconds?

#### Attached Files:

• ###### equation.jpg
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2. Jan 29, 2006

### dicerandom

What did you plug in? We can't help you if we don't know what you've tried to do.

3. Jan 29, 2006

### Mortimer

Hint: which one is bigger, $T_0$ or $T_1$?

4. Jan 29, 2006

### mijoon

After approx 5.449 secs of Earth time, the spaceship will be 1 sec. behind.
In your thumbnail, Earth time should be on the left of the equation.