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kayranicole1
30.08.2019 •
Mathematics
In a certain city, electricity costs $0.15 per kw·h. what is the annual cost for electricity to power a lamp-post for 7.00 hours per day
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Ответ:
Assuming the power rating of the lamp-post is 100 watt.
Then, the energy consumption of the lamp-post is given by 100 x 2,555 = 255,500 watt hour.
But 1,000 watt hour makes 1 kilowatt hour,
thus the energy consumption is 255,500 / 1,000 = 255.5 kw h.
Given that the cost of electricity is $0.15 per kw h, therefore, the cost of 255.5 kw h of electricity is given by 255.5 x 0.15 = $38.33 kw h.
Ответ:
40cm * 10 = 400 km
50km/50 = 1cm
400km/50 = 8cm
A: 8cm