(a) when rebuilding her car's engine, a physics major must exert 300 n of force to insert a dry steel piston into a steel cylind

Answer:

2.57 hours

Explanation:

Let t (in hours) represent the time it takes for Elsie to walk until they are separated by 25 miles. Since Steve starts 2 hours earlier, his time will be t + 2.

The distance covered by Steve heading north is

The distance Elsie travels heading west is

The separation between Steve and Elsie is

We can solve for t by squaring both sides.

Therefore, t = 2.57 or t = -4.13.

Since t cannot be negative, we select t = 2.57 hours.