calculating energy efficiency\nusing this energy transformation diagram of a battery - powered drill, what…
calculating energy efficiency\nusing this energy transformation diagram of a battery - powered drill, what is the drills thermal energy output?\nkinetic energy 45 j\nchemical energy 100 j\nthermal energy? j\nsound 20 j
Answer
Explanation:
Step1: Apply energy - conservation principle
The total input energy is the chemical energy of the battery, which is 100 J. The total output energy is the sum of kinetic, sound, and thermal energies. Let the thermal energy be $x$. Then, according to the law of conservation of energy, the input energy equals the output energy. So, $100=45 + 20+x$.
Step2: Solve for thermal energy $x$
We can rewrite the equation as $x=100-(45 + 20)$. First, calculate the sum inside the parentheses: $45+20 = 65$. Then, $x=100 - 65$.
Answer:
35