The Disc Brakes of a High Performance Car Are Often

question 11

Multiple Choice

The disc brakes of a high performance car are often made of carbon fiber instead of iron,thereby reducing the mass.If both types of discs are of the same size and shape,and each iron disc has a mass of 4 kg and each carbon disc has a mass of 1 kg,what is the reduction in rotational kinetic energy at 72 km/h if all the four iron discs in the car are replaced with carbon discs?

• A)300 J
• B)400 J
• C)800 J
• D)1200 J
• E)1600 J

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Definitions:

Book Values

The value of an asset or liability according to a company's balance sheet, accounting for depreciation or amortization.

Capital Interest

Capital Interest refers to the interest on investment that is considered part of the cost of a fixed asset or is capitalized.

Bonus

A bonus refers to a financial compensation that is above and beyond the normal payment expectations of its recipient.

Total Capital

The sum of a company's debt and equity, indicating the total funds available for business operations and investment.