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March 26, 2017

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If 7.00hp are required to drive a 1500-kg automobile at 66.0 km/h on a level road. What power is necessary to drive the car at 66.0 km/h down a 1.00 % grade? It requires 42.9 hp to drive the car at 66.0 km/h up a 10.0 % grade (a hill rising 10.0 m vertically in 100.0 m horizontally)? The total retarding force due to friction, air resistance, and so on is 285 N.

  • Physics - ,

    Is the following a statement of fact or a question?

    << It requires 42.9 hp to drive the car at 66.0 km/h up a 10.0 % grade (a hill rising 10.0 m vertically in 100.0 m horizontally)? >>

  • Physics - ,

    It is a fact.

  • Physics - ,

    Then why the question mark at the end?

    Assume 35.9 extra hp is needed to provide the potential energy increase at that speed and 10% positive slope. At 1/10 the slope (1%) downwards, 3.6 hp is recovered from gravity, so the engine needs to provide only 3.4 hp.

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