Question

exam lesson name: energy conversions
exam number: 700697rr
exam guidelines
exam instructions
question 4 of 20 :
select the best answer for the question.

1. a temperature of 20°c is equivalent to approximately

a. 32°f
b. −6°f
c. 136°f
d. 68°f
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Explanation:

Step1: Recall the formula to convert Celsius to Fahrenheit.

The formula to convert Celsius (\(C\)) to Fahrenheit (\(F\)) is \(F = \frac{9}{5}C + 32\).

Step2: Substitute \(C = 20\) into the formula.

Substitute \(C = 20\) into \(F=\frac{9}{5}C + 32\), we get \(F=\frac{9}{5}\times20 + 32\).
First, calculate \(\frac{9}{5}\times20\). \(\frac{9}{5}\times20=9\times4 = 36\).
Then, add 32 to the result: \(36 + 32=68\). So \(20^{\circ}C\) is equivalent to \(68^{\circ}F\).

Answer:

D. \(68^{\circ}F\)