COLLEGE PHYSICS,VOL.1
COLLEGE PHYSICS,VOL.1
2nd Edition
ISBN: 9781111570958
Author: Giordano
Publisher: CENGAGE L
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Chapter 3, Problem 46P

(a)

To determine

Distance required to bring the car to a stop when the car is skidding.

(a)

Expert Solution
Check Mark

Answer to Problem 46P

The distance is 54m_.

Explanation of Solution

According to Newton’s laws

    a=μKg        (I)

Here μK is the coefficient of kinetic friction and g is the acceleration due to gravity.

The acceleration is in the opposite direction from the velocity, and so has a negative sign.

Then the distance travelled is,

    Δxskid=v022a=v022(μKg)=v022μKg        (II)

Here v0 is the velocity.

Conclusion:

Substitute 65mi/h for v0, 0.80 for μK and 9.8m/s2 for g in (II)

    Δxskid=(65mi/h(0.44704m/s1mi/h))22(0.80)(9.8m/s2)=54 m  180 ft

The distance is 54m_.

(b)

To determine

Distance required to bring the car to a stop when the wheels are not locked up.

(b)

Expert Solution
Check Mark

Answer to Problem 46P

The distance is 48m_.

Explanation of Solution

In the case of non-skidding, the distance covered would be

    Δxnoskid=v022μsg

Here μs is the coefficient of kinetic friction

Conclusion:

Substitute 65mi/h for v0, 0.90 for μs and 9.8m/s2 for g in (II)

    Δxnoskid=(65mi/h(0.44704m/s1mi/h))22(0.90)(9.8m/s2)=48 m  160 ft

The distance is 48m_.

(c)

To determine

The distance the wheels go if the wheels lock into a skidding stop.

(c)

Expert Solution
Check Mark

Answer to Problem 46P

The distance is 5.9m_.

Explanation of Solution

The skidding car goes by

    ΔxskidΔxnoskid=53.6m47.7 m=5.9m

Or,

    ΔxskidΔxnoskid=53.6m47.7 m=1.13

The ratio implies that at any speed, the skidding car will have 13% higher stopping distance. The antilock brakes allow the wheels to keep turning the car is accelerated by kinetic friction.

The stopping distance with antilock brakes is shorter.

Conclusion:

The distance is 5.9m_.

(d)

To determine

Whether antilock brake makes big difference in emergency stops.

(d)

Expert Solution
Check Mark

Answer to Problem 46P

The stopping distance of cars with antilock brakes are significantly shorter around 13% and the car is safer during emergency stop. Yes, it makes a difference.

Explanation of Solution

Antilock brakes generally offers improved vehicle control and decreases stopping distances on dry and some slippery surfaces, on loose gravel or snow-covered surfaces. They significantly decrease braking distance, while still improving steering control.

Conclusion:

Therefore, the stopping distance of cars with antilock brakes are significantly shorter around 13% and the car is safer during emergency stop. Yes, it makes a difference.

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Chapter 3 Solutions

COLLEGE PHYSICS,VOL.1

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