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Ira Lisetskai [31]
3 years ago
15

Consider a household that uses 22.0 kW-hour of electricity per day on average. Most of that electricity is supplied by fossil fu

els. To reduce their carbon footprint, the household wants to install solar panels, which receive on average 376 W/m^2 from the Sun each day.
A) If the solar panels are 18.1% efficient (fraction of solar energy converted into useable electrical energy), what area of solar panels is needed to power the household?
Physics
1 answer:
Lelu [443]3 years ago
3 0

Answer:

A_{net} = 13.469\,m^{2}

Explanation:

The daily energy consumption of the household is:

\Delta E_{day} = (22\,kWh)\cdot (\frac{3600000\,J}{1\,kWh} )

\Delta E_{day} = 79200000\,J

The needed area of solar panel to power the household is:

\Delta E_{day} = \eta\cdot G\cdot A_{net}\cdot \Delta t

A_{net} = \frac{\Delta E_{day}}{\eta\cdot G\cdot \Delta t}

A_{net} = \frac{79200000\,J}{(0.181)\cdot (376\,\frac{W}{m^{2}} )\cdot (86400\,s)}

A_{net} = 13.469\,m^{2}

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On an approximate scale, A child breaths 20 times a minute as compared to only 12 to 16 in resting phase of an Adult.

So, In 60 minutes (1 hour), They breathe = 20 * 60 = 1200
In 24 hours (1 day), They breathe = 1200 * 24 = 28,800

In short, Your Answer would be: 28,800

Hope this helps!
5 0
3 years ago
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A motor boat is headed at a velocity of 25 kilometers/hour toward the north, while the velocity of the water current is 12 kilom
Tems11 [23]

Explanation:

CON EL TEOREMA DE PITÁGORAS

<em>v</em> = \sqrt{(12 km/h)^{2} + (25 km/h)^{2}} = 27.7 km/h

8 0
3 years ago
A rectangle has an area measuring 1350 square centimeters. Its length and width are whole numbers of centimeters. What are the p
Aleks04 [339]

The smallest perimeter of the rectangle is of value 150 cm.

Given:

The area of the rectangle, A = 1350 cm²

Calculation:

Let the length of the rectangle be 'x'

      the breadth of the rectangle be 'y'

We know that the area of a rectangle is given as:

A = (x) × (y)  

Applying values in the above equation we get:

xy = 1350 cm²

Factorizing the value of 1350, the possible values of length and breadth of the rectangle is as listed below:

x (cm)         y (cm)

1350      ×       1

675       ×       2

450       ×       3

270       ×       5

225       ×       6

150        ×       9

135        ×       10

90         ×       15

75         ×        18

54         ×        25

50         ×        27

45         ×        30         (least possible value)

Thus, the smallest perimeter of the rectangle can be calculated as:

P = 2 (x + y)

  = 2 (45 + 30)

  = 150 cm

Therefore, the smallest perimeter that the rectangle will have is 150 cm.

Learn more about factorization here:

<u>brainly.com/question/9231261</u>

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7 0
2 years ago
King Arthur is riding his horse toward a raised drawbridge of his castle with a velocity of five m/s westward. The drawbridge at
Dominik [7]
Yes , the drawbridge will finish lowering 1 second before king arthur arrives 
8 0
3 years ago
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Please answer<br>my quastions​
Neko [114]

Answer:

a) 120 N

b) 5 N

c) 0.2 N

d) Mass remains the same, and weight decreases.

Explanation:

<em>Use the formula W = mg, where mass is in kg, and gravitational field strength in N/kg.</em>

a)

W = mg

= 12 × 10

= <u>120 N</u>

b)

500 g = 0.5 kg

W = mg

= 0.5 × 10

= <u>5 N</u>

c)

20 g = 0.02 kg

W = mg

= 0.02 × 10

= <u>0.2 N</u>

d)

<u>Mass remains the same, and weight decreases.</u>

6 0
2 years ago
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