The worker in the loading zone has been complaining about fatigue and the lack of rest. You measure his heart rate and find it to be 125 beats/min and slowly increasing during work. When he sits down, the heart rates dropped to 120 beats/min by the end of the first minute of rest and 100 beats/min by the end of the third minute. Based on heart rate guidelines, does the worker work with a good working condition and have sufficient rest? Yes

The worker in the loading zone has been complaining about fatigue and the lack of rest. You measure his heart rate and find it to be 125 beats/min and slowly increasing during work. When he sits down, the heart rates dropped to 120 beats/min by the end of the first minute of rest and 100 beats/min by the end of the third minute. Based on heart rate guidelines, does the worker work with a good working condition and have sufficient rest? Yes

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.22P: 1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas...

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1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas gives both an air temperature and the wind-chill temperature. The air temperature is measured with a thermometer that is not affected by the wind. However, the rate of heat loss from the skier increases with wind velocity, and the wind-chill temperature is the temperature that would result in the same rate of heat loss in still air as occurs at the measured air temperature with the existing wind. Suppose that the inner temperature of a 3-mm-thick layer of skin with a thermal conductivity of 0.35 W/m K is and the air temperature is . Under calm ambient conditions the heat transfer coefficient at the outer skin surface is about (see Table 1.4), but in a 40-mph wind it increases to . (a) If frostbite occurs when the skin temperature drops to about , do you advise the skier to wear a face mask? (b) What is the skin temperature drop due to the wind?