Assignment:
Q1. Telephoto lens. Please Use this formula:
1 / f = 1 / 0 + 1 / i
to find the image distance i for an object that is 2,000,000 mm from a 250-mm telephoto lens.
Uniform Motion Problems. Show a complete solution to each problem.
Q2. Upstream, downstream. Junior’s boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of the current?
Q3. Big plane. A six-passenger plane cruises at 180 mph in calm air. If the plane flies 7 miles with the wind in the same amount of time as it flies 5 miles against the wind, then what is the wind speed?
Q4. Filling a tank. A water tank has an inlet pipe and a drain pipe. A full tank can be emptied in 30 minutes if the drain is opened and an empty tank can be filled in 45 minutes with the inlet pipe opened. If both pipes are accidentally opened when the tank is full, then how long will it take to empty the tank?
Provide complete and step by step solution for the question and show calculations and use formulas.