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?
1 answer:
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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