anonymous
  • anonymous
Four weightlifters (A-D) enter a competition. The mass, distance, and time of their lifts are shown in the table (will draw inside!) Which weightlifter has 14,900 W of power? A, B, C, or D ?
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
|dw:1433099459717:dw|
anonymous
  • anonymous
sorry that is so messy!! w=weighlifter next column is "mass (kg)" then "distance (m)" and then "time(s)
anonymous
  • anonymous
values for mass: 100, 150, 200, 250 values for distance: 2.25, 1.76, 1.50, 1.25 values for time: 0.151, 0.052, 0.217, 0.206 in case it was too messy above lol :P

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Michele_Laino
  • Michele_Laino
here we have to compute this quantity: \[\frac{{mgD}}{t}\] for all of your four cases
Michele_Laino
  • Michele_Laino
since the power developed by the worker is given by this formula: \[\frac{{mgD}}{t}\]
anonymous
  • anonymous
ok! how can we plugin?
Michele_Laino
  • Michele_Laino
for example, if we consider the case of worker A, we get: \[\frac{{mgD}}{t} \cong 14618\;Watt\]
Michele_Laino
  • Michele_Laino
\[\frac{{mgD}}{t} = \frac{{100 \times 2.25 \times 9.81}}{{0.151}} \cong 14618\;Watt\]
anonymous
  • anonymous
oh okay! so for B we get 49804 C=13562 D=14881 so our solution is weighlifter D?
Michele_Laino
  • Michele_Laino
for case D, is D=1.75 meters?
anonymous
  • anonymous
it is 1.25 :)
Michele_Laino
  • Michele_Laino
sorry!
anonymous
  • anonymous
haha yes my bad it got very messy!!
anonymous
  • anonymous
so it would be weightlifter D is our answer?
Michele_Laino
  • Michele_Laino
yes! that's right! It is option D
anonymous
  • anonymous
yay!
Michele_Laino
  • Michele_Laino
:)

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