# Homework Help: Does it make since if it takes 675 food Calories to lift me up 17 ft?

1. Oct 17, 2005

### mcca408

does it make since if it takes 675 food Calories to lift me up 17 ft
look below

*IGNORING HORIZONTAL DISTANCE*
i gotta figure out how much work is done to get myself up from my class to the cafeteria which is 17 ft in vertical hieght
PE=mgh
my weight is 120 lbs i converted to mass
54.545 Kg which makes 54,545 g

multiply that by gravity 10 (yes i know 9.8 but my teacher is stupid and confusing)

then multiply that by hieght which is 17 ft but its got to be Meters so i did 5.1816

so i get Work = 2,826,303.72 Joules
got to convert that to FOOD Cal and i got around 675
with this conversion
J * (1 cal/4.187J) * (1 Food Cal/1,000cal) = Food Calories

so does that makes since it takes 675 food Calories to lift me up 17 ft

2. Oct 17, 2005

### Erwin Schrodinger

The standard unit for mass is kilograms. Your answer is 1000 times too big because you converted kilograms to grams.

3. Oct 17, 2005

### Pengwuino

mass is in kilograms

4. Oct 18, 2005

### mcca408

thanks now i got a more resonable answer