A spaceship traveling at 0.7370c relative to the Earth monitors a motorcycle drag race on Earth. The space travelers measure the time from the start to the finish of the race to be 15.25 s. What is the proper time interval for the motorcycle race

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.

How to spend their limited resources.

Ineed to see that diagram.

The answer would be choice b.     b)