A stretched wire of vibrating length L has a frequency of 350 Hertz when set into resonance. When the length of the wire is increased by 15cm at constant tension, the wire vibrates with a frequency of 280 Hertz at resonance. Find the value of L​

1) what is the power in horsepower of a 100 watt light bulb? what is the power in kilowatts of a 200 horsepower engine? 2) if a cars engine is providing 3000 n of force to keep the car moving at 5 m/s, what is the engine’s effective power? 3) how many gallons of water will be pumped from a well 30 feet deep by a 1/2 hp engine in 1 minute? (1 gallon weighs 8.34 pounds)