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anonymous

  • 4 years ago

A car has an engine which delivers a constant power. It accelerates from rest at time t = 0, and at t = t0 its acceleration is a0. What is its acceleration at t = 2t0? Ignore energy loss due to friction.

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  1. anonymous
    • 4 years ago
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    constant power meaning, constant force acting .. so i guess acceleration remains unchanged?!

  2. anonymous
    • 4 years ago
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    .nope. got the answer :) P = FV = ma*at = ma^2 t . therefore m(a0)^2t = m(x)^2 (2t) solve for x which is the acceleration at 2t. answer is a0/sqrt(2). mission achieved :) intuitively, acceleration needs to be negative, else the engine would go one forever.

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  3. anonymous
    • 4 years ago
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    go on accelerating forever that is. it needs to reach a "carrying capacity"

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  4. anonymous
    • 4 years ago
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    |dw:1327496547738:dw| so u are right

  5. anonymous
    • 4 years ago
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    um...i know. and no P does not increase. yes. and it should then be =ma dv/dt. why did you repost?

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