1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
jolli1 [7]
3 years ago
15

You are driving a 2420.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an inters

ection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides to a halt in a distance of 26.8 m.
What is the coefficient of kinetic friction between your tires and the wet road?
Physics
1 answer:
Mila [183]3 years ago
5 0

Answer:

U_k = 0.3731

Explanation:

First we will identify the important data of the question.

M = 2420 kg

V = 14 m/s

d = 26.8 m

U_k = ?

So, we will use the law of the conservation of energy, it says that:

E_i - E_f = W_f

therefore:

E_i = \frac{1}{2}MV^2\\E_f = 0\\W_f = F_kd

where F_k is the friction force

Replacing on the first equation, we get:

\frac{1}{2}MV^2 -0 = F_kd

F_k is also equal to U_kN

where N is the normal force and Uk is the coefficient of kinetic friction.

solving the equation:

\frac{1}{2}(2420)(14)^2 = U_kN(26.8)

Before solve for U_k we need to know the value of N, so we use the law of newton as:

∑F_y = N - (2420)(9.8m/s) = 0

N = 23716

Finally, just solve for U_k as:

U_ k = \frac{\frac{1}{2}(2420)(14)^2 }{(26.8)(23716)}

U_k = 0.3731

You might be interested in
A mass of gas under constant pressure occupies a volume of 0.5 m3 at a temperature of 20°C. Using the formula for cubic expansio
Kryger [21]
No cubic expansion given
6 0
3 years ago
A box that weighs 5.00×10^2 N is sliding down a ramp at a constant speed. The angle the ramp makes with the horizontal is 25°. W
maxonik [38]

Answer:

0.466 (3 sig. fig.)

Explanation:

Frictional force acting on the box = 5.00×10^2xsin25

Normal force acting on the box = 5.00×10^2xcos25

coefficient of friction = 0.466 (3 sig. fig.)

5 0
3 years ago
1. The planet Jupiter completes a revolution of the sun in 11.5 years. Express it in seconds. Given that one year= 3.154 × 10^7
xenn [34]

Answer:

The planet Jupiter completes one revolution of the sun in 362710000 seconds. Long time, right?

Explanation:

3.154x10^7=3.154x10000000=31540000

11.5x31540000=362710000

7 0
1 year ago
What do you know about nuclear energy?​
aev [14]

Answer:

Nuclear energy comes from splitting atoms in a reactor to heat water into steam, turn a turbine and generate electricity. Ninety-three nuclear reactors in 28 states generate nearly 20 percent of the nation's electricity, all without carbon emissions because reactors use uranium, not fossil fuels.

<h2>please follow me</h2>
6 0
2 years ago
At what time were the racers at the same position?<br> O 15<br> O 3s<br> O 5s<br> 0 4s
Jlenok [28]
The Answer is:

O 3s

Hope you got it right.
5 0
3 years ago
Read 2 more answers
Other questions:
  • Which process requires more energy: completely vaporizing 1 kg of saturated liquid water at 1 atm pressure or completely vaporiz
    12·1 answer
  • A gas exerts less pressure when it has a
    10·1 answer
  • As you watch the surfers right away towards the shoreline what is the shoreline
    10·1 answer
  • Two bicyclist, originally separated by a distance of 20 miles, are each traveling at a uniform speed of 10 miles per hour toward
    14·1 answer
  • A capacitor is charged until it holds 5.0 j of energy. it is then connected across a 10-kω resistor. in 13.6 ms , the resistor d
    5·1 answer
  • How long does it take light to travel 850 km in a vacuum? Answer in ms.(Express your answer to two significant figures.)
    12·1 answer
  • Which of the following is the newton used to measure? answer
    14·1 answer
  • 16. Calculate the mass in kg of an object that is being accelerated 12 m/s with a force of 654 N.
    14·2 answers
  • The terms mass and weight are often used interchangeably. When you purchase produce from the grocery store, you place your items
    12·2 answers
  • What is the resistance of a bulb of 40w connected in a line of 70v​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!