3 years ago

Hannah drove her car 318.4 km in 4 h. At this speed, how far can she expect to travel in 5.5 h?

1 answer:

3 0

If she drives 318.4 km for 4 hours, then if we divide 318.4 by 4 we get 79.6 km per hour.

79.5km per hour x 5.5 hours

=437.8 km

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3 years ago

The wheels on Darlene's car have on 11-inch radius. If the wheels are rotating at a rate of 378 rpm, find the linear speed in mi

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Answer:

The linear speed in which Darlene is traveling is 24.74 miles per hour.

Step-by-step explanation:

The wheel experiments rolling, which is a combination of translation and rotation. The point where linear speed happens is located at geometrical center of the wheel and instantaneous center of rotation is located at the point of contact between wheel and ground. The linear speed ( $v$ ), measured in inches per second, is defined by following expression:

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Where:

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If we know that $R = 11\,in$ and $\omega \approx 39.584\,\frac{rad}{s}$ , then the linear speed, measured in miles per hour, in which Darlene is traveling is: