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
Sveta_85 [38]
4 years ago
13

At an accident scene on a level road, investigators measure a car's skid mark to be 93 m long. It was a rainy day and the coeffi

cient of friction was estimated to be 0.35. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. Express your answer to two significant figures and include the appropriate units
Physics
1 answer:
USPshnik [31]4 years ago
6 0

Answer:

u = 25 m/s

Explanation:

given,                                

length of skid = 93 m          

coefficient of friction = 0.35

final velocity = 0 m/s              

initial velocity = ?                        

force here is friction  f = μ mg

F = ma                                                

now com paring                      

-μ mg = m a                      

a = - μ g                    

a = - 0.35 x 9.8              

a = -3.43 m/s²

we know,              

v² = u² + 2 a s                        

0 = u² - 2 x 3.43 x 93                

u² = 637.98                    

u = 25.26 m/s                      

u = 25 m/s (two significant figure)

You might be interested in
Which of the following properties did Rutherford use in his experiment?
Ronch [10]

<u>Answer</u>:

(C) The positive charge of the alpha particles and the negative charge of the electrons  are the properties Rutherford used in his experiment

<u>Explanation</u>:

In his scattering experiment, scientist Ernest Rutherford used the property of positively charged alpha particles and negatively charge electrons. He performed this experiment by passing some of the alpha particles through a gold foil. The result was that the some alpha particles scattered while some passed through the gold foil without collision.

He concluded that the alpha particles are centrally positively charged and needed a large amount repelling force. This experiment of Rutherford is also known as Rutherford model of atom. This experiment helped him in doing so many other discoveries.

3 0
4 years ago
Force has _____. magnitude direction gravity weight
Contact [7]

Answer:

magnitude

Explanation:

7 0
4 years ago
Read 2 more answers
Why is the term scientific methods more accurate than scientific method?
bagirrra123 [75]
Because it’s a scientific method so it’s a scientific method
5 0
3 years ago
The rollercoaster is near the
Sveta_85 [38]

Answer:

A. It has mostly kinetic energy

Explanation:

Kinetic energy refers to movement. Potential energy refers to height. In this case, the big drop just got over. So, when the coaster is at the bottom, it has more kinetic than potential energy . Potential energy is still present but kinetic is more at the bottom.

5 0
3 years ago
Which one of the following equations correctly represents the process relating to the ionization energy of X?
Naily [24]

Answer:

The correct option is E. X(g) → X⁺(g) + e⁻

Explanation:

The electrons are attracted to the nucleus and it is necessary to provide energy to start them. Then the ionization energy is the energy necessary to pull an electron to a gaseous atom, isolated and in a fundamental state. The electrons in the last shell are the most weakly attracted to the nucleus, so these are the lost electrons.

In this way, the gaseous element is converted to a gaseous cation (positively charged ion).

Taking this definition into account, <u><em>the correct option is E. X(g) → X⁺(g) + e⁻</em></u>

7 0
3 years ago
Other questions:
  • A ball is dropped from the top of a tall building h=5m about how long does it take for the ball to hit the ground.
    5·1 answer
  • Can anyone help me? Physics
    15·1 answer
  • Which is an example of fraudulent bookkeeping on the income side?
    8·1 answer
  • A sample that is treated exactly like the other experimental groups except that the variable is not applied to it is a(n) _____.
    7·1 answer
  • Calcular la velocidad tangencial y la velocidad angular de un movil que describe una circunferencia de 18 centimetros de radio e
    12·1 answer
  • An ideal blackbody in physics and astronomy is an object that
    12·1 answer
  • Two guitars are playing together producing a beat frequency. The first guitar is playing at a frequency of 867 Hz and the beat i
    8·1 answer
  • What is the electric potential at a distance of 1.2 m from a 7.5 UC point charge?
    7·2 answers
  • Acceleration is a change in speed or direction over time. In what two ways does the sled accelerate as it descends?
    10·1 answer
  • Which two of the following actions would
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!