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Kipish [7]
2 years ago
14

If the coefficient of kinetic friction between tires and dry pavement is 0.93. What is the shortest distance in which you can st

op an automobile by locking the brakes when traveling at 33.6 m/s ?
Physics
1 answer:
Alexeev081 [22]2 years ago
4 0

The shortest distance over which a car moving at 33.6 m/s may be stopped by locking the brakes is  61.93 m

The kinetic friction coefficient is 0.93.

using N, where N is the normal reaction = mg, frictional force can be evaluated.

Fr =- 0.93 x 9.8 = -9.114 m/s²

Friction, which takes the form of a decelerating force, helps the car come to a stop.

This frictional force equals the ma force, 

where ma = 7.84 m and a = 7.84 m/s2.

However, this acceleration is negative at 7.84 m/s2 since it is decelerating.

So, using the equations of motion,

v² = u² + 2ax

where;

v = final velocity

u = initial velocity

a = acceleration

0 = 33.6² + 2(-9.114)x

0 = 1128.96 - 18.228x

18.228x = 1128.96

x = 1128.96/18.228

x = 61.93 m

Therefore, the shortest distance is 61.93 m

To know more about shortest distance refer to:  brainly.com/question/16751593

#SPJ4

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A turtle takes 3.5 minutes to walk 18 m toward the south along a deserted highway. A truck driver stops and picks up the turtle.
Akimi4 [234]

Answer:

3.59 m/s

Explanation:

The average velocity is defined as:

\frac{Total displacement}{Total time}

The turtle first walks 18m south, and then is taken 1,1Km (or 1100m) north. Thus, the total displacement  is 1082m north (1100m north - 18m south).

Now we have to calculate the total time, which will be equal to the sum of the time the turtle walked and the time it was taken by truck.

The walking time is 3.5 minutes. Since 1 minute = 60 seconds, then the walking time is 210 seconds.

To calculate the truck time we use the equation:

Time = \frac{Distance}{Speed}

Where the distance the truck travelled is 1100m and the speed of the truck is 12m/s.

Thus,

Truck time= \frac{1100m}{12m/s}= 91.67s

The total time is the sum of the walking time and the truck time.

Total time = 210s + 91.67s = 301.67s.

As mencioned previously, the average velocity is equal to total displacement/ total time, thus:

Average velocity = \frac{1082m}{301.67s} = 3.59 m/s North

Since the average velocity is a vector, it has a magnitude and a direction. In this case the magnitude is 3.59 m/s and the direction is north since the turtle's final displacement is north of where it started.

8 0
3 years ago
A trained eye in the dark for an extended period of time may pick up a light stimulus from a light source, at the lowest radiate
frez [133]

Answer:

    #_photons = 30 photons / s

Explanation:

Let's start by finding the energy of a photon of light, let's use the Planck relation

         E = h f

the speed of light is related to wavelength and frequency

         c = λ f

we substitute

         E = h c /λ

         E₀ = 6.63 10⁻³⁴ 3 10⁸/500 10⁻⁹

         E₀ = 3.978 10⁻¹⁹ J

now let's use a direct proportion rule. If the energy of a photon is Eo, how many fornes has an energy E = 1.2 10⁻¹⁷ J in a second

          #_photons = 1 photon   (E / Eo)

          #_photons = 1  1.2 10⁻¹⁷ /3.978 10⁻¹⁹

          #_photons = 3.0 10¹

          #_photons = 30 photons / s

3 0
2 years ago
A wave front has the form of a
podryga [215]
Your answer is "<span>surface of a sphere"

Hope this helps.</span>
3 0
3 years ago
It takes at least 4 people to push a refrigerator up a 10-meter ramp. How many people would be needed to push the same refrigera
vaieri [72.5K]
Double the amount of people because the ramp went from 10-meter to 20-meter, so times by 2. 4 times 2 is 8.
The answer is 8 people.
Hope this helps!
Please give Brainliest!
8 0
2 years ago
a place that is typically cold because of an increase in altitude would most likely have what type of climate? dry climate mild
Marta_Voda [28]
A place that is cold because of an increase in altitude has a mountain area climate or simply, mountain climate. An area that is high in altitude typically has a colder temperature because of the increased amount of rainfall they have. Also, air tends to cool as it rises in temperature. 
3 0
3 years ago
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