Use the formula - power work/time to calculate the power required in each of the following.1.) A weightlifter lifts a 1,250-N(Newtons) barbell 2m in 3secHow much power was used to lift the barbell?2.) A crane lifts a 35,000N(Newtons) steel grider a distance of 25m in 45 secHow much power did the crand require the grider? Write your answer in kilowatts.Thank you [:
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Answers - 18.60 W, 19,444.4 W EVEN if you don't care about the math, read below, because there are some important things (1) Convert time to seconds 60 seconds in a minute 123 s So I need a displacementthis is going to introduce errorLet's say the guy's 6 ft tall, and he's doing some strange lift that makes it a 6 foot liftSo displacement 1.83 m Keep in mind, this is NOT a given valueI'm just making a guess herePerhaps there's a way to do it without, but I'm unawareIf you're given a different value, just fill in the new value with the same calculationGiven F 1,250 N t 123 s D 1.83 m (guess) Power (Force Displacement) / Time P FD/T P [ (1,250 N) (1.83 m) ] / (123 s) P [ 2,287.5 N-m ] / (123 s) P (18.60 kg-m^2/s^3) P 18.60 W (Watt - sometimes expressed as J/s, or Joules per second) (2) F 35,000 N t 45 s D 25 m P FD/T P [ (35,000 N) (25 m) ] / (45 s) P [ 875,000 N-m ] / (45 s) P 19,444.4 W (could also be expressed as 1.9E+4 W in more scientific notation to get rid of those eternal 4s)
