On average, an adult person breathes in about 6 liters of air per minute. assuming atmospheric pressure and 20°c air temperature, estimate the mass of air in kilograms that a person breathes in per day.

The problem can be covered from different methods for development. I will approximate it by the proximity method. We know that the person breathes about 6 liters per minute, that is (Recall that )

Given the conditions, we have that at atmospheric pressure with a temperature of 20 ° C the air density is

Therefore, from the density ratio, the mass would be

Here,

m = mass per time unit

V = Volume per time unit

= Density

We have

Using the conversion factor from minutes to days,

Therefore he mass of air in kilograms that a person breathes in per day is 10.7136kg

b.a device that inputs heat into a cool object

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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