Question detail
If a machine does 200 joules of work in 5 seconds, what is its power output?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Energy changes in a system, and the ways energy is stored before and after such changes
Question
If a machine does 200 joules of work in 5 seconds, what is its power output?
Answer
The power output of the machine is 40 watts.
Explanation
This answer demonstrates the application of the power formula, which is power = work done / time. The question tests the student's ability to apply this formula to calculate power in a practical scenario. This answer is linked to Power because it applies the learning objective: Define power as the rate at which work is done.. It shows the Physics relationship clearly and keeps energy, power, work done and efficiency terms distinct where they appear.
Common mistake
Misunderstanding Power Definition
Students often confuse power with energy, thinking it is the total energy transferred rather than the rate at which work is done.
Emphasize that power is defined as the rate at which work is done, and it is measured in watts (W), which is equivalent to joules per second.
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