Answer:
Explanation:
The equation for this problem is:
where <em>m</em> is the mass, <em>c</em> is the specific heat capacity, and <em>ΔT </em> is the change in temperature.
The mass is 3 kilograms, but the specific heat capacity includes grams in the units. Convert kilograms to grams. There are 1000 grams in 1 kilogram.
The specific heat capacity for lead is found on the table. It is 0.129 J/g°C.
Let's find the change in temperature. It is raised from 15 °C to 20 °C.
Now we know every value.
- m= 3000 g
- c= 0.129 J/g°C
- ΔT= 5 °C
Substitute the values into the formula.
Multiply the first 2 numbers together. The units of grams cancel.
Multiply again. This time the units of degrees Celsius cancel.
<u>1935 Joules of energy</u> are required and <u>choice C</u> is correct.