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
Arisa [49]
3 years ago
11

A student of mass 63.4 kg, starting at rest, slides down a slide 21.2 m long, tilted at an angle of 26.1° with respect to thehor

izontal. If the coefficient of kinetic friction between the student and the slide is 0.113, find the force of kinetic friction, theacceleration, and the speed she is traveling when she reaches the bottom of the slide. (Enter the magnitudes.)HINT(a)the force of kinetic friction (in N) N(b)the acceleration (in m/s) m/s(c)the speed she is traveling (in m/s) m/s
Physics
1 answer:
Vera_Pavlovna [14]3 years ago
3 0

Answer:

fr = 65.46 N ,   a = 8.74 m / s²  and  vf = 19.25 m / s

Explanation:

We write a reference system with an axis parallel to the slide and gold perpendicular axis, in this system we decompose the weight

      sin 21.2 = Wx / W

      cos21.2 = Wy / W

      Wx = W sin21.2

      Wy = W cos 21.2

We form Newton's equations

X axis

      Wx -fr = m a

Y Axis

     N- Wy = 0

     N = Wy

     fr = μ N

     fr = μ (W cos 21.2)

     fr = 0.113 63.4 9.8 cos 21.2

     fr = 65.46 N

We replace and calculate the acceleration

     W sin 21.2 - μ W cos 21.2 = m a

     a = g (sin21.2 - μ cos 21.2)

     a = 9.8 (without 21.2 - 0.113 cos 21.2)

     a = 8.74 m / s²

This acceleration is along the slope of the slide, so we can calculate the distance

     d = 21.2 m

     vf² = v₀² + 2 a d

    vf² = 0 + 2 a d

    vf = √(2 8.74 21.2)

    vf = √ (370,576)

    vf = 19.25 m / s

You might be interested in
Light is created by the motion of charged particles. <br><br>O True <br>O False​
nevsk [136]

Answer:

true

Explanation:

8 0
3 years ago
Read 2 more answers
Which of the following exhibits different types of motion
elixir [45]
Car moving on the road
3 0
3 years ago
While playing a scavenger hunt game, Anthony walks 48.0 m to the south and then walks 12.0 m to the west. What single straight-l
Alenkasestr [34]
As these are distances created by moving in a straight line, using a trigonometric analysis can solve the missing single straight-line displacement. Looking at the 48m and 12m movements as legs of a triangle, obtaining the hypotenuse using the pythagorean theorem will yield us the correct answer.
This is shown below:

c^2 = 48^2 + 12^2
c = sqrt(2304 + 144)
c = sqrt(2448)
c = 49.48 m

To obtain the angle at which Anthony walks 49.48, we obtain the arc tangent of (12/48). This is shown below:

arc tan (12/48) =14.04 degrees.

Therefore, Anthony could have walked 49.48 m towards the S 14.04 W direction.
4 0
3 years ago
Difference between contrition and compunction
nordsb [41]
<span>Compunction is similar to an obligation; if you are "under compunction," then you are bound by some debt or sentence to do something. Repentance is actually an action rather than a feeling or condition: it is an act of the will which disowns whatever behavior you regret, and to repent implies a determination not to make the same mistake again. Contrition is the expressed emotion of being sorry for something; if you went to a person you had wronged, to make amends and ask their forgiveness, you would be "contrite" toward them. Remorse is simply another word for regret - you feel bad within yourself, either for what you did or for how the consequences affected you.</span>
8 0
3 years ago
A wire carries a current of 0.66 A. This wire makes an angle of 58° with respect to a magnetic field of magnitude 5.50 10-5 T. T
Oliga [24]

Answer:

The length of the wire is "1.93 m".

Explanation:

Given:

Current,

I = 0.66 A

Angle,

\Theta = 58°

Magnetic field of magnitude,

F = 5.5\times 10^{-5} N

The length of the wire will be:

⇒ F = B\times I\times L\times Sin \Theta

or,

⇒ L = \frac{F}{B\times I\times Sin \theta}

By putting the values, we get

       =\frac{5.5\times 10^{-5}}{0.66\times 5.1\times 10^{-5}\times Sin \ 58^{\circ}}

       =\frac{5.5}{2.828}

       =1.93 \ m

6 0
3 years ago
Other questions:
  • Which scientist first showed a clear connection between mechanical energy and heat?
    8·1 answer
  • A crate with a mass of 187.5 kg is suspended from the end of a uniform boom. The upper end of the boom is supported by the tensi
    12·1 answer
  • Given that mH = 1.007825 u, is the mass of a hydrogen atom 1H greater than, less than, or equal to 1/12 the mass of a 12C atom?
    14·1 answer
  • You are attempting to row across a stream in your rowboat. Your paddling speed relative to still water is 3.0 m/s (i.e., if you
    5·1 answer
  • Why is cell called structual unit of life​
    13·1 answer
  • A coin rests 11.0 cm from the center of a turntable. The coefficient of static friction between the coin and turntable surface i
    14·1 answer
  • Explain what major mistake producers made when editing the battle scenes for the movie Star Wars
    15·1 answer
  • A passenger at the rear of a train traveling at 15 m/s relative to earth throws a baseball with a speed of 15 m/s in the directi
    12·1 answer
  • After two hours, 1/16 of the initial amount of a certain radioactive isotope remains undecayed. The half-life of the isotope is:
    11·1 answer
  • Can someone help me ASAP!! Please &amp; thank you!
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!