A 1100-kg car sits at rest at the bottom of a 15 degree hill. The driver initiates the accelerator and the engine pushes it up a 15 degree hill with a net force of 4500 N parallel to the hill. There is an effective 0.1 coefficient of kinetic friction. Use energy concepts to calculate the speed of the car after it has moved 40 m along the hill’s surface. 10.1 Fuel Cell StackConsider a hydrogen fuel cell stack operating with 25 cells connected in series operating at standardconditions (25°C, 1 atm). Each cell has an active area of 80 cm?, a current density of 0.85 A/ cm? and avoltage of 0.5 V. Determine:1. Water production per hour for the stack (in grams)2. Stack voltage and electrical power output.3. Overall loss to irreversibilities.

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Description: A 1100-kg car sits at rest at the bottom of a 15 degree hill. The driver initiates the accelerator and the engine pushes it up a 15 degree hill with a net force of 4500 N parallel to the hill. There is an effective 0.1 coefficient of kinetic friction

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College Physics

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ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

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A 1100-kg car sits at rest at the bottom of a 15 degree hill. The driver initiates the accelerator and the engine pushes it up a 15 degree hill with a net force of 4500 N parallel to the hill. There is an effective 0.1 coefficient of kinetic friction. Use energy concepts to calculate the speed of the car after it has moved 40 m along the hill’s surface.

10.1 Fuel Cell Stack
Consider a hydrogen fuel cell stack operating with 25 cells connected in series operating at standard
conditions (25°C, 1 atm). Each cell has an active area of 80 cm?, a current density of 0.85 A/ cm? and a
voltage of 0.5 V. Determine:
1. Water production per hour for the stack (in grams)
2. Stack voltage and electrical power output.
3. Overall loss to irreversibilities.

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