Final answer:
In an 8-hour shift of chopping down trees with an energy expenditure of 8.0 kcal/min, a rest allowance of 960 kcal should be allowed, which equates to approximately 2 hours of rest.
Step-by-step explanation:
To calculate the rest allowance for chopping down a tree, we can use the energy expenditure associated with this activity, which is 8.0 kcal/min. The rest allowance is typically calculated as a percentage of the total work time. In this case, we will calculate the rest allowance based on an 8-hour shift.
First, we need to determine the total energy expenditure for chopping down a tree in an 8-hour shift. To do this, we convert the energy expenditure per minute to energy expenditure per hour:
Energy expenditure per minute = 8.0 kcal/min
Energy expenditure per hour = 8.0 kcal/min * 60 min = 480 kcal/hour
Next, we calculate the total energy expenditure for an 8-hour shift:
Total energy expenditure
Energy expenditure per hour 8 hours = 480 kcal/hour 8 hours = 3840 kcal
The rest allowance is typically calculated as a percentage of the total energy expenditure. The rest allowance percentage can vary depending on factors such as the intensity of the activity and individual health considerations. For this calculation, we will use a rest allowance percentage of 25%.
Now, we calculate the rest allowance:
Rest allowance = Total energy expenditure x Rest allowance percentage Rest allowance = 3840 kcal x 0.25
Rest allowance = 960 kcal
Finally, to determine how many hours in an 8-hour shift should be allowed for rest, we divide the rest allowance by the energy expenditure per hour:
Hours allowed for rest = Rest allowance / Energy expenditure per hour
Hours allowed for rest = 960 kcal / 480 kcal/hour
Hours allowed for rest = 2 hours