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Rina8888 [55]
3 years ago
6

Normally the rate at which you expend energy during a brisk walk is 3.6 Calories per minute. (A Calorie is the common unit of fo

od energy, equal to 4184.1 J.) How long do you have to walk to produce the same amount of energy as a 150 W lightbulb that is lit for 5.8 hours?
Mathematics
1 answer:
Sindrei [870]3 years ago
7 0

Answer:

3.5 hour

Step-by-step explanation:

During a brisk walk, rate at which energy is expended is P(expend) = 3.6 calories per min

1 calorie = 4184.1 J

Energy produced by bulb is P(bulb) = 150W

time = 5.8 hrs

Convvert 5.8 hrs to secs. we have

t = 5.8*3600

t= 20880 secs

Power = Energy/time

150 = energy / 20880

Energy = 150 * 20880

= 3132000J

Convert the rate at which cv h energy is expended into joules per second, we have

(3.6 * 4184.1)/60

P(expend) = 251J/s

= 251W

Recall that P = E/t

t = E/p

t = 3132000/251

t = 12478 secs

Convert secs to hour

t = 12478/ 3600

t= 3.5 hours

The time requtied to produce the s\me amount of energy as 150W bulb that lights up 5..8hrs is t = 3.5 hrs

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<h3>How do you determine the number of revolutions in a circle?</h3>

The total distance covered in one revolution will be equal to the perimeter of the wheel. Finally, to find the total number of revolutions, divide the total distance by distance covered in one revolution.

Given that,

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Therefore,

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The height, h of the screw in the final half turn is given by the relation;

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