Why it is not easy to whril a hammer by a longer chain?

An ambulance emits a frequency of 450 hz from its siren. what frequency is heard by a man as the ambulance moves toward him? less than 450 hz more than 450 hz 450 hz 0 hz

What is required for an electric charge to flow through a wire? zero resistance in the wire a balance of electric potential high resistance in the wire a difference in electric potential

Will mark as brainliest how does a catapult increase the trajectory of an object? ps. answer as if u were a 5th grader