You are training for a marathon. While training, you lose energy by evaporation at a rate of 360. How much water mass do you lose while running for 3.0 h?

360 what?

360 W

To determine the amount of water mass you lose while running for 3.0 hours, we need to consider the rate of energy loss through evaporation and the duration of the activity.

The rate of energy loss through evaporation is given as 360, but we need to convert this value into a meaningful unit first. Let's assume that the rate is given in calories per hour (cal/h).

Now, we need to use the concept of energy equivalence. This concept states that for every 1 gram of water evaporated, it takes 1 calorie of energy. Therefore, to find the amount of water mass lost, we can directly convert the energy loss in calories to grams of water.

Step 1: Convert the rate from an hourly basis to a 3-hour basis:
- Energy loss rate (cal/h) = 360
- Energy loss rate for 3 hours (cal/3h) = 360 * 3 = 1080 cal/3h

Step 2: Convert the energy loss to water mass loss:
- Water mass loss (grams) = Energy loss (calories)

Therefore, in this case, the amount of water mass you lose while running for 3.0 hours would be 1080 grams.