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En bil er udstyret med en brndselscelle, der omstter brint til elektrisk energi, samt en elmotor. Bilen har massen 1400 kg. Fra stilstand har bilen

En bil er udstyret med en brndselscelle, der omstter brint til elektrisk energi, samt en elmotor. Bilen har massen 1400 kg. Fra stilstand har bilen de frste 2,0 sekunder en acceleration pa 8,5 m/s2 pa vandret vej.

a) Beregn den resulterende kraft pa bilen de frste 2,0 sekunder af accelerationen.

b) Beregn strkningen, bilen tilbagelgger de frste 2,0 sekunder af accelerationen.

Side 4 af 6

Idet de frste 2,0 sekunder er gaet, nar elmotoren sin maksimale effekt, hvormed den arbejder pa at fa bilen op i fart.

c) Beregn motorens maksimale effekt, idet der kan ses bort fra luftmodstand.

d) Beregn den mindste friktionskoefficient mellem vejen og bilens dk, for at bilen kan foretage accelerationen.

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