The Amount of Sunshine Illuminating a Wall of a Building

question 111

Multiple Choice

The amount of sunshine illuminating a wall of a building can greatly affect the energy efficiency of the building. The solar radiation striking a vertical wall that faces east is given by the formula where R ₀ is the maximum solar radiation possible, is the angle that the sun makes with the horizontal, and is the direction of the sun in the sky, with = 90 ^o when the sun is in the east and = 0 ^o when the sun is in the south. What percentage of R ₀ is striking the wall when is equal to 30 ^o and the sun is in the southeast?
Round the answer to the nearest integer.

• A)71 %
• B)61 %
• C)56 %
• D)76 %
• E)29 %

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Definitions:

Discount Period

The timeframe within which a buyer can take advantage of a discount for paying an invoice early.

F.O.B Shipping Point

Free on Board Shipping Point, a term indicating that the buyer takes responsibility for goods the moment they leave the seller's premises.

Discount Period

The time frame in which a buyer may take advantage of a discount offered by a seller for early payment.

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The price at which a product or service is sold, typically listed on an invoice as the cost before any discounts or allowances.