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2 years ago

12

When the driver of a car travelling at 36km/h suddenly sees a pedestrian in front of a car, he applies the brakes. The reaction

time of the driver is 0.2s. If the maximum deceleration that the brakes can produce is 20ms, find the maximum stopping distance for the car.

1 answer:

egoroff_w [7]2 years ago

4 0

Answer:

144

Explanation:

36x0.2=7.2

7.2x20=144

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What is the mass of a large ship that has a momentum of 1.60×109kg·m/s, when the ship is moving at a speed of 48.0 km/h? (b) Com

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a) The mass of the ship is $1.2\cdot 10^8 kg$

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a)

The momentum of an object is given by:

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m is the mass of the object

v is its velocity

For the ship in this problem, we have

$p=1.60\cdot 10^9 kg m/s$ is the momentum

$v=48.0 km/h \cdot \frac{1000 m/km}{3600 s/h}=13.3 m/s$ is the velocity

Solving for m, we find the mass of the ship:

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b)

The momentum of the artillery shell is given by

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where

m is its mass

v is its velocity

For the shell in this problem,

m = 1100 kg

v = 1200 m/s

Substituting,

$p=(1100)(1200)=1.32\cdot 10^6 kg m/s$

So, we see that the ship has a larger momentum.

Learn more about momentum:

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