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Engineering and Tech / Fundamentals of Thermodynamcs 8 / Chapter 3 / Problem 123HP

Fundamentals of Thermodynamcs | 8th Edition | ISBN: 9781118131992 | Authors: Claus Borgnakke, Richard E. Sonntag

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A car with mass 1275 kg is driven at 60 km/h when the

Chapter 3, Problem 123HP

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QUESTION:

Problem 123HP

A car with mass 1275 kg is driven at 60 km/h when the brakes are applied quickly to decrease its speed to 20 km/h. Assume that the brake pads have a 0.5-kg mass with a heat capacity of 1.1 kJ/kg K and that the brake disks/drums are 4.0 kg of steel. Further assume that both masses are heated uniformly. Find the temperature increase in the brake assembly.

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QUESTION:

Problem 123HP

A car with mass 1275 kg is driven at 60 km/h when the brakes are applied quickly to decrease its speed to 20 km/h. Assume that the brake pads have a 0.5-kg mass with a heat capacity of 1.1 kJ/kg K and that the brake disks/drums are 4.0 kg of steel. Further assume that both masses are heated uniformly. Find the temperature increase in the brake assembly.

ANSWER:

Solution

Step 1 of 3

We need to find out the temperature increase in the brake assembly.

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