Question detail
If a machine does 1200 joules of work in 30 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 1200 joules of work in 30 seconds, what is its power output?
Answer
40 W
Explanation
This question assesses the understanding of the relationship between work done, time, and power, requiring the application of the formula P = W/t. This answer is linked to Power because it applies the learning objective: Rearrange power equations to calculate energy transferred, work done or time.. It shows the Physics relationship clearly and keeps energy, power, work done and efficiency terms distinct where they appear.
Common mistake
Common Mistake in Rearranging Power Equations
Students often confuse the formulas for power, energy transferred, and work done, leading to incorrect rearrangements.
To correctly rearrange the power equations, remember that power (P) can be calculated as P = energy transferred (E) / time (t) or P = work done (W) / time (t). Ensure you isolate the variable you need by multiplying or dividing appropriately.
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