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
Reil [10]
3 years ago
15

One horse is pulling a 755 kg sled straight ahead applying a force of 1988 N. If the acceleration of the sled is 1.36 m/s2, what

is the coefficient of kinetic friction between the sled and the ground?
Physics
1 answer:
Inessa [10]3 years ago
4 0

Answer:

The coefficient of kinetic friction is 0.13

Explanation:

Newton's second law states that the acceleration of an object is proportional to the net force on it, the factor of proportionality is the mass. So, we can express that law mathematically as:

\sum\overrightarrow{F}=m\overrightarrow{a} (1)

With F the net force, m the mass and a the acceleration of the object. In our case we're interested on what's happening to the sled, then we have to analyze the forces on it, those forces are the weight and the normal force on the vertical direction and the pulling force and frictional force in the horizontal direction. So, because (1) is a vector equation we can express that in their vertical (y) and horizontal (x) components:

F_y=ma_y (2)

F_x=ma_x (3)

On y we have that the acceleration is zero because the sled is not moving upward or downward, remember that the net force on y is the weight (W) pointing downward and the normal force pointing upward:

F_y=W+n=0

Following the convention that positive is upward and negative downward, W=mg=(755)(-9.81):

F_y=(755)(-9.81)+n=0

n=7406.55 N (4)

Now on the x direction we have the sum of the forces is the pulling force (T) and friction force (f)

F_x=F+f=ma_x

Choosing the direction where the horse is pulling F=1988N and the acceleration should be positive too, then:

1988+f=m(1.36)

f=(755)(1.36)-1988=-961.2 N

The negative sign means it's in the opposite direction the horse is pulling

The frictional force is related with the coefficient of kinetic friction in the next way:

|f|=\mu_k n

with μk the coefficient of kinetic friction, and n the normal force that we already found on (4), so we simply solve the last equation for μk:

\mu_k=\frac{|f|}{n}=\frac{961.2}{7406.55}=0.13

You might be interested in
It took 1700 J of work to stretch a spring from its natural length of 2m to a length of 5m. Find the spring's force constant.
Alenkasestr [34]
The work to stretch a spring from its rest position is

               (1/2) (spring constant) (distance of the stretch)²

           E = 1/2 k x² .

You said it takes 1700 joules to stretch the spring 3 meters from its rest position, so we can write

                 1700 joules  =  1/2 k (3m)²

1 joule = 1 newton-meter

                 1700 N-m =  1/2 k  (3m)²

Multiply each side by 2:   3400 N-m  =  k · 9m²   

Divide each side by  9m²     k  =  3400 N-m / 9m²

                                                   =  (377 and 7/9)   newton per meter    

7 0
3 years ago
Read 2 more answers
Write a description of this race using these words.
podryga [215]

Answer:

Race refers to physical differences that groups and cultures consider socially significant. For example, people might identify their race as Aboriginal, African American or Black, Asian, European American or White, Native American, Native Hawaiian or Pacific Islander, Māori, or some other race.

Explanation:

hope this helps

8 0
3 years ago
Which type of energy is stored in fuels such as gasoline and batteries
AnnyKZ [126]

Answer:

Chemical Energy

Explanation:

Chemical energy is energy stored in the bonds of atoms and molecules. Batteries, biomass, petroleum, natural gas, and coal are examples of chemical energy.

7 0
3 years ago
Will give brainliest
Ivan

Answer:

i cant see the the pic its glitched post a new one i will help

Explanation:

4 0
3 years ago
Why does a smaller car get better gas mileage than a bigger one?​
Paladinen [302]

Answer:

Vehicle weight is the biggest single enemy of fuel economy. A heavy vehicle simply needs more power than a smaller one to produce

Explanation:

7 0
3 years ago
Other questions:
  • A roller coaster track is a good example of the law of conservation of energy. Use this law to explain these facts about a rolle
    12·2 answers
  • 5. A massless string passes over a frictionless pulley and carries
    11·1 answer
  • The gravity model predicts that the optimal location of a service is
    15·1 answer
  • 5. Lady Gaga needed someone to buy more meat for her meat dress. The famous
    12·1 answer
  • A throttle position sensor waveform is going to be observed. At what setting should the volts per division be set to see the ent
    11·1 answer
  • With the aid of a string, a gyroscope is accelerated from rest to 16 rad/s in 0.40 s. what is its angular acceleration in rad/s2
    13·1 answer
  • An elevator of mass M is at rest when its cable breaks. The elevator falls a distance h before it encounters a massless, cushion
    12·1 answer
  • A researcher is studying traffic patterns at an intersection before an upcoming construction project. As part of this investigat
    8·2 answers
  • The driver of a car traveling at 23.1 m/s applies the brakes and undergoes a constant
    13·1 answer
  • One fine summer day a group of students was jumping from a railroad bridge into the river below. They stepped off the bridge wit
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!