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Reil [10]
3 years ago
10

"12 cents per kilowatt-hour (kwh), a 114 MPGe (combined) Nissan Leaf costs 90 cents per 25 miles,"

Engineering
1 answer:
snow_lady [41]3 years ago
4 0

Explanation:

25 mi × (1 gallon-equivalent / 114 mi) = 0.219 gallon-equivalent

0.219 gallon-equivalent × (34 kWh / gallon-equivalent) = 7.46 kWh

7.46 kWh × (12 cents / kWh) = 89.5 cents

Rounded up to the nearest cent, it costs 90 cents per 25 miles.

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A resistance of 30 ohms is placed in a circuit with a 90 volt battery. What current flows in the circuit?
blagie [28]

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Explanation:

Using Ohms law U=I×R solve for I by I=U/R

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3 years ago
A heat engine that rejects waste heat to a sink at 520 R has a thermal efficiency of 35 percent and a second- law efficiency of
xeze [42]

Answer:

The source temperature is 1248 R.

Explanation:

Second law efficiency of the engine is the ratio of actual efficiency to the maximum possible efficiency that is reversible efficiency.

Given:  

Temperature of the heat sink is 520 R.

Second law efficiency is 60%.

Actual thermal efficiency is 35%.

Calculation:  

Step1

Reversible efficiency is calculated as follows:

\eta_{II}=\frac{\eta_{a}}{\eta_{rev}}

0.6=\frac{0.35}{\eta_{rev}}

\eta_{rev}=0.5834

Step2

Source temperature is calculated as follows:

\eta_{rev}=1-\frac{T_{L}}{T}

\eta_{rev}=1-\frac{520}{T}

0.5834=1-\frac{520}{T}

T = 1248 R.

The heat engine is shown below:

Thus, the source temperature is 1248 R.

6 0
3 years ago
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