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With the popularization of new energy, low carbon and other concepts, Xiaohua has creatively designed cars using solar cells as energy sources. This is some data he found.

(1) The forward mechanical power of the automobile is 3040w;

(2) The maximum power that the solar panel on the car can provide is 3378W.

Test analysis: (1) v = 72km/h = 20m/s.

Mechanical power of automobile: machine P = Fv = KMGV = 0.02× 760kg×10n/kg× 20m/s = 3040w.

(2) The maximum power that solar panels can provide.

Comments: This question examines students' mastery and application of the efficiency formula (the ratio of useful power to total power). It is necessary to use the formula flexibly to solve practical problems by using the knowledge learned.

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