Posted by **Katie** on Wednesday, January 30, 2013 at 9:02am.

Bob and Bob Jr. stand at open doorways at opposite ends of an airplane hangar 25 m long. Anna owns a spaceship, 40 m long as it sits on the runway. Anna takes off in her spaceship, then swoops through the hangar at constant velocity. At precisely time zero on both Bob's clock and Anna's, Bob sees Anna at the front of her spaceship reach his doorway. At time zero on his clock, Bob Jr. sees the tail of Anna's spaceship at his doorway.

A) How fast is Anna's spaceship moving?

v/c = 0.781

L = Lo / Yv

--> 25 = 40 (square root) 1 - (v/c)^2

But how do you solve for v? I tried subtracting 25 and squaring it to get rid of the square root. But I just don't know how to get to v = 0.781 c

Thank you for any help

## Answer this Question

## Related Questions

- Physics - Bob and Bob Jr. stand at open doorways at opposite ends of an airplane...
- Math - Anna and bob play a game in which Anna begins by rolling a fair dice, ...
- Math/Probability - Anna and bob play a game in which Anna begins by rolling a ...
- Physics - According to Anna, on Earth, Bob is on a spaceship moving at 0.8c ...
- math stuff - suppose to arrage the names of the ppl in descending order of their...
- physics - Suppose we have Bob the astronaut sitting without a space suit in a ...
- physics - An airplane reaches a velocity of 71m/s^2 when it takes off. What must...
- physics - A 20000 kg airplane takes off by traveling 300 m down a runway while ...
- Physics - A jet plane has a takeoff speed of Vto=125km/h (34.72 m/s) and it's ...
- Physics - An airplane must reach a speed of 240.5 mi/h in order to take off. If ...