Machine A does 7200 J of work in 15 s. Machine B does 10 400 J of work in 26 s.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Machine A does of work in . Machine B does of work in . Which machine has more power, and what are the two powers?
Need a reminder? The key ideaShow
Power , in watts: . The energy used is , with in seconds.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. A. .
Step 2. B. .
Answer: A, with against , though B does more work.
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