A pump with a power input of 21 hp pumps water from a source to a pool at a rate of 43.0 li/s. The free surface of the pool is
24 m above source. Determine the mechanical power used to
overcome frictional effects in piping if the pump efficiency is 80%.

Because if a good speech is delivered badly it can bore the audience, confuse them, or make them distrust the speakeri think they all come back to this one, except that last answer because that is false. if your audience starts making fun of you or gets distracted it is because they are either bored, confused or distrust you.