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ValentinkaMS [17]

3 years ago

5

If the average distance between bumps on a road is about 10 m and the natural frequency of the suspension system in the car is a

bout 0.90 hz, at what speed will you feel the bumps the most?

1 answer:

Mnenie [13.5K]3 years ago

3 0

When you hit a bump every 0.9 seconds.

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The kinetic energy of a moving object is E=12mv2. A 61 kg runner is moving at 10kmh. However, her speedometer is only accurate t

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Answer:

$e=3367.2J$

% $e=1.43$ %

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From the exercise we know two information. The real speed and the experimental measured by the speedometer

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$v_{e}=10km/h-0.1km/h=9.9km/h=2.75m/s$

Knowing that we can calculate Kinetic energy for the real and experimental speed

$E_{r}=\frac{1}{2}mv^2=\frac{1}{2}(61000g)(2.77m/s)^2=234023J$

$E_{e}=\frac{1}{2}mv^2=\frac{1}{2}(61000g)(2.75m/s)^2=230656J$

Now, the potential error in her calculated kinetic energy is:

$e=E_{r}-E_{e}=(234023-230656)J=3367.2J$

% $e=\frac{E_{r}-E_{e}}{E_{r}}x100=\frac{(234023-230656)J}{234023J}x100=1.43$ %

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