First slide

Physical quantities and units

Question

It is estimated that per second each square meter of earth receives about 1400 J of heat energy from the Sun. This is called Solar constant. The value of solar constant in some system is _________ cal/cm²-min. (1 cal = 4.2 J) .

Moderate

Solution

$\begin{array}{l} 1400 J / m^{2} - \sec = n cal / {cm}^{2} - \min \\ \Rightarrow \frac{1400 J}{m^{2} - \sec} = n \cdot \frac{4.2 J \times 10000}{m^{2} - 60 \sec} \\ \Rightarrow n = 2 \end{array}$

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