Does sound travel in vacuum? Why?

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?

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)