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3 years ago

Not including thinking distance, lawful brakes must stop a car at 20 miles per hour within how many feet?

Physics

2 answers:

Svetradugi [14.3K]3 years ago

5 0

Answer:

B. 25 feet

Explanation:

In most cities in US, passenger car brakes must stop a car moving at 20 miles per hour at 25 feet.

Therefore, the correct option is "B" 25 feet

Sholpan [36]3 years ago

4 0

Answer:

<u>Option-(B):</u> The ideal distance that a lawful brakes must stop a car traveling at a speed of 20 miles per hour <u>is about 20 feet.</u>

Explanation:

If are often asked not speed too much while traveling, because some times we are not able to control the machine that we are driving. And the government or the concerned authorities are directed to develop a system to prevent any damage to any person on the road. The road roads bumps are thus made to prevent any road accidents which can some times be very fatal to multiple individuals.

<u>But, we have the scientific formulas to know about the situations. As we have the equation.</u>

Brakes or stoppage distance= (Speed of the car)²/ speed of the same car,

Now if we insert the values then we get that:

<u>Stoppage distance= 20 feet.</u> ⇒<u> Answer.</u>

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In which city did the wright brothers take off on their very first flight

Nezavi [6.7K]

<h2>Answer: Kitty Hawk, North Carolina </h2>

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3 years ago

For the long life cells we have to connect them in ____ combination

NISA [10]

Answer:

Parallel combination.

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3 years ago

Read 2 more answers

1. A student is biking to school. She travels 0.7 km north, then realizes something has fallen out of her bag.

Snezhnost [94]

Explanation:

(a) Displacement of an object is the shortest path covered by it.

In this problem, a student is biking to school. She travels 0.7 km north, then realizes something has fallen out of her bag. She travels 0.3 km south to retrieve her item. She then travels 0.4 mi north to arrive at school.

0.4 miles = 0.64 km

displacement = 0.7-0.3+0.64 = 1.04 km

(b) Average velocity = total displacement/total time

t = 15 min = 0.25 hour

$v=\dfrac{1.04\ km}{0.25\ h}\\\\v=4.16\ km/h$

Hence, this is the required solution.

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3 years ago

A pizza delivery driver must make three stops on her route. She will first leave the restaurant and travel 4 km due north to the

topjm [15]

Explanation:

This question involves continuous displacement in various directions. When it becomes difficult to imagine, vector analysis becomes handy.

Let us denote each of the individual displacements by a vector. Consider the unit vectors $\vec{i}\textrm{ and }\vec{j}$ as the unit vectors in the direction of East and North respectively.

By simple calculations, we can derive the unit vectors $\vec{j},\frac{-\vec{i}-\vec{j}}{2}\textrm{ and }\frac{-\frac{1}{2}\vec{i}+\frac{\sqrt{3}}{2}\vec{j}}{2}$ in the directions North, $45^{o}$ South of West and $60^{o}$ North of West respectively.