A 2,000 Kg Car Is Traveling at 40

question 72

Multiple Choice

A 2,000 kg car is traveling at 40.0 m/s and then puts on the brakes and comes to a complete stop. The heat generated at the brakes due to stopping heats up the brakes. The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg °C. What is the increase in the temperature of the brakes?

• A) 66.6 °C
• B) 75.4 °C
• C) 87.5 °C
• D) 95.6 °C
• E) 117 °C

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Definitions:

Ace

In card games, an ace refers to a playing card that typically ranks the highest in its suit.

Lowest 4%

Refers to the bottom 4% of data points in a distribution, highlighting the far left end of the data spectrum or values significantly below the median.

Lowest 40%

Refers to the bottom forty percent of a distribution or set of data points, often discussed in the context of income or wealth distributions.

Z > 0.59

A condition specifying that the value of the Z-score in a statistical analysis is greater than 0.59, often related to standard deviation measurements in normal distribution.