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(edited 8 years ago)
Original post by Katie2014
please can any of you help me?

The rate of working P watts of an engine travelling at v m/s is given by: P = 10v + 4000/v, v > 0 Find the value of v for which P is least (showing that it is) and hence find this smallest value of P


thanks in advance


Find dv/dp

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Original post by Katie2014
ive tried but I get a completely wrong answer


Post a picture of your working and I'll have a look

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Andy98
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Original post by Katie2014
please can any of you help me?

The rate of working P watts of an engine travelling at v m/s is given by: P = 10v + 4000/v, v > 0 Find the value of v for which P is least (showing that it is) and hence find this smallest value of P


thanks in advance


You know how to differentiate that?
Original post by Katie2014
not really, tried to make a second equation to sub in but that didn't work


How could you rewrite 4000/v ?

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