## anonymous one year ago 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 ?

1. anonymous

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2. anonymous

sorry that is so messy!! w=weighlifter next column is "mass (kg)" then "distance (m)" and then "time(s)

3. 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

4. Michele_Laino

here we have to compute this quantity: $\frac{{mgD}}{t}$ for all of your four cases

5. Michele_Laino

since the power developed by the worker is given by this formula: $\frac{{mgD}}{t}$

6. anonymous

ok! how can we plugin?

7. Michele_Laino

for example, if we consider the case of worker A, we get: $\frac{{mgD}}{t} \cong 14618\;Watt$

8. Michele_Laino

$\frac{{mgD}}{t} = \frac{{100 \times 2.25 \times 9.81}}{{0.151}} \cong 14618\;Watt$

9. anonymous

oh okay! so for B we get 49804 C=13562 D=14881 so our solution is weighlifter D?

10. Michele_Laino

for case D, is D=1.75 meters?

11. anonymous

it is 1.25 :)

12. Michele_Laino

sorry!

13. anonymous

haha yes my bad it got very messy!!

14. anonymous

so it would be weightlifter D is our answer?

15. Michele_Laino

yes! that's right! It is option D

16. anonymous

yay!

17. Michele_Laino

:)