# The specific heat of iron is 0.11 cal (g°C) . A cafeteria fork made of iron has a mass of 20 grams. How much heat energy is needed to raise the temperature of this fork from 25°C to 75°C?

## A) 0.044 calories B) 0.275 calories C) 110 calories D) 9090.9 calories

Feb 8, 2017

C

#### Explanation:

Required heat $Q$ to raise the temperature of fork $= m s \Delta T$
where $m$ is mass, $s$ is specific heat and $\Delta T$ is change in temperature.

Inserting given values we get

$Q = 20 \times 0.11 \times \left(75 - 25\right)$
$\implies Q = 20 \times 0.11 \times 50$
$\implies Q = 110 \text{ cal}$