Posted by **hilary** on Wednesday, January 6, 2010 at 5:54pm.

Nate is 165 cm tall, 40 cm wide, and weighs 710 N. He needs to walk ten blocks (1000 m) against a 50 km/h head-wind.

Nate pushes on the ground with the minimum force that allows him to move slowly forward at a constant speed, and against the drag from the wind.

How much energy does Nate spend?

- physics -
**drwls**, Wednesday, January 6, 2010 at 6:11pm
You need to estimate the wind drag force based upon his projected area. That area is 1.65 x 0.40 = 0.66 m^2

The drag force is approximately

(1/2)*(body area)*(air density)*(headwind speed)^2

The air density is about 1.2 kg/m^3

His weight will not matter except for a basic metabolism energy burning rate, which they did not ask for.

Multiply the drag force (in Newtons) by the distance traveled (1000 m) for the energy (work) required, in Joules.

There is no exact answer to this one. Drag coefficients depend upon shape; I used a value of 1.

## Answer this Question

## Related Questions

- math - To make shelves for a bookcase, Nate needs 7 pieces of lumber, each 45 ...
- math - Nate's front yard was 50 feet wide. each time he pushed the mower along ...
- Math - nate owes michael 5.00 nate expressed how much he owes as an integer ...
- math - Last month, Nate spent 12% of his paycheck on car repairs and 25% of the ...
- math - Last month, Nate spent 12% of his paycheck on car repairs and 25% of the ...
- math - Nathan owes Michael $5.00.Nate expressed how much he owes as an integer....
- Math - tina, troy and nate had a total of 25 equal-sized square tiles to place ...
- physics - Two blocks with masses m1 = 13.4 kg and m2 = 74.2 kg, shown in the ...
- physics - Two blocks with masses m1 = 20.7 kg and m2 = 55.5 kg, shown in the ...
- physics - Two blocks with masses m1 = 10.9 kg and m2 = 79.3 kg, shown in the ...

More Related Questions