Hello and welcome to digital tea with mystery, where we will see what's brewing in the world of physics solutions. So in this particular problem, we have a basketball player who is running around playing basketball for a full hour, and in that hour they have an average of, um, a power exertion of 30 watts. So, um, this is a very active person as they average, you know, 30 jewels per second used each hour. Um, so in the diagram, I have the person dribbling a basketball and a bunch of blue dots. If you're running with the blue dots is, it's what naturally happens to basketball players. When they put out a lot of exertion, they sweat. In fact, basketball players sweat a lot. So at any rate, this person is perspiring. You may wonder, why does somebody sweat when they do a lot of work? Well, the answer is simply this. The body puts out the water onto the surface of the skin. Then the heat that is being generated by the body and doing all that work is utilized to Vape arise that water and then put it off into the atmosphere. So, as a result, you can think of the human body as a heat engine and it's using, um uh, it's heat to evaporate the water, thus carrying heat away from the body, hence making the body, uh, stay cooler. So the sweat itself doesn't cool you down. It's the evaporation of that sweat that cools down. So what are we trying to find in this problem? Well, uh, probably the most disgusting thing we confined. How much mass of sweat will be vaporised by this person as they play basketball for an hour? So let's start off first with a time of being one hour, Um, change at the 3600 seconds. How you do that, You might ask. You simply multiply 60 seconds in a minute. Time. 60 minutes in an hour together and you get 60 times 60 or 3600. And then I have the latent ah, heat of vaporization for water listed there, a 2.26 times ended the six jewels per kilogram. So let's figure out how much work this person does this start. Um so power is equal to work overtime, so the work will equal the power multiplied by the time so if we take our power of 30 wants and we multiply it by 3600 seconds to get a total of 108 fouls and jewels of work is done in playing basketball for an hour now, over into determining how much masses of sweat that's going to be evaporated are evaporated off, you'd want to say that that work causes the body to heat up, so W is going to equal cute and it's being vaporized. Therefore, the work is going to equal to the latent heat equation of M. L. So solving for mass is simply a case of taking the work, dividing it by the latent heat of fusion are vaporization. The mass of the water mass of water will be equal to We'll take that 108,000 jewels of work that we figured out and divided by the latent heat of vaporization of 2.26 times ended 26 jewels per kilogram, and it gives us a total of 0.5 kilograms. So about 50 grams s, so to speak of water ah will be evaporated in that hour. You know, you shouldn't have to wonder anymore. Why? One needs to drink plenty of fluids in the time outs and basketball is. What you're doing is you're replacing the water and some other chemicals as well, um, into the body so that they can continue to sweat out sweat. Hey, thanks for learning with me. I certainly enjoyed learning with you.