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
Sladkaya [172]
3 years ago
5

A box of mass 12 kg is at rest on a flat floor. The coefficient of static friction between the box and floor is 0.42. What is th

e minimum force needed to set the box in motion across the floor?
31 N

62 N

49 N

119 N
Physics
2 answers:
denpristay [2]3 years ago
7 0

Given data:

mass of the box (m) = 12 kg,

                            W = m.g

                                = 12 kg × 9.8 m/s²

                                 = 117.6 N

coefficient of static friction (μ) = 0.42,

determine the minimum force needed to set the box in motion(F) = ?

Important Point: The minimum force required to move a body is proportional to the weight of the body. Please find the attached figure.

                              F ∝ W

                              F = μ. W Newtons

                              μ = It is the constant proportionality also known as coefficient of static friction.

                  The normal reaction of the body R = W

                  Therefore,

                               F = μ . R Newtons

                   Where,  

                              F = Minimum force required to move a body, N

                               F = 0.42 × 117.6

                                  = 49.39 N  

<em>The minimum force is needed to move a body on flat floor is 49 N</em>

                                       


vladimir2022 [97]3 years ago
5 0

As we know that friction force on box is given by

F_s = \mu_s N

here we know that

N = mg

here we have

m = 12 kg

\mu_s = 0.42

so now we have

N = 12(9.8) = 117.6 N

now we will have

F_s = 0.42(12)(9.8)

F_s = 49.4 N

so it required minimum 49 N(approx) force to move the block

You might be interested in
A care package is dropped from an airplane flying at 1000 m above sea level with a velocity of 200 m/s to an island. If it takes
ikadub [295]

Answer:3000

Explanation:

4 0
3 years ago
Which of the following is not a characteristic of a creative person
Katarina [22]
<span>B.Extrinsic motivation </span>
7 0
3 years ago
Read 2 more answers
Select the correct answer.
nignag [31]

Answer:

B

Explanation:

because if grocery store has a weak stability it will collapse when face strong naturally weather

7 0
2 years ago
Suppose a certain car supplies a constant deceleration of A meter per second per second. If it is traveling at 90km/hr. When. th
aksik [14]

Answer:

i)-6.25m/s

ii)18 metres

iii)26.5 m/s or 95.4 km/hr

Explanation:

Firstly convert 90km/hr to m/s

90 × 1000/3600 = 25m/s

(i) Apply v^2 = u^2 + 2As...where v(0m/s) is the final speed and u(25m/s) is initial speed and also s is the distance moved through(50 metres)

0 = (25)^2 + 2A(50)

0 = 625 + 100A....then moved the other value to one

-625 = 100A

Hence A = -6.25m/s^2(where the negative just tells us that its deceleration)

(ii) Firstly convert 54km/hr to m/s

In which this is 54 × 1000/3600 = 15m/s

then apply the same formula as that in (i)

0 = (15)^2 + 2(-6.25)s

-225 = -12.5s

Hence the stopping distance = 18metres

(iii) Apply the same formula and always remember that the deceleration values is the same throughout this question

0 = u^2 + 2(-6.25)(56)

u^2 = 700

Hence the speed that the car was travelling at is the,square root of 700 = 26.5m/s

In km/hr....26.5 × 3600/1000 = 95.4 km/hr

3 0
3 years ago
Brad walks and jogs to schooll every day. He averages 5 km/hr walking and 9 km/hr jogging. The distane from home to shool is 6 k
Vitek1552 [10]
We know that
Distance = speed x time
Let w be the time Brad spent walking. The time spent jogging will be 1 - w
6 = 5w + 9(1 - w)
w = 0.75 hours
Distance walked = 0.75 x 5
= 3.75 km
5 0
3 years ago
Other questions:
  • If gravity on the moon is 1.62m/s, what is the weight of a 200g rock on the moon
    10·1 answer
  • An upward force is applied to a 6.0–kilogram box. this force displaces the box upward by 10.00 meters. what is the work done by
    7·2 answers
  • What is the elevation of Y and Z? Y=3250, Z=2950 Y=3200, Z=2900 Y=3250, Z=2900 Y=3000, Z=2850
    13·1 answer
  • Name the three different types of radiation and describe how they are different in their penetrating abilities. Explain.
    6·2 answers
  • I need help with this physics question, "A skateboarder rolled down the sidewalk with an initial velocity of 2.5m/s. If her acce
    6·1 answer
  • If the x-component of velocity is 27m/s and the y-component of velocity is -23 m/s, what is the resultant vector?
    6·1 answer
  • The lowest note on a piano
    15·1 answer
  • SOMEBODY ONCE TOLD ME THE WORLD WAS GONNA ROLL ME
    6·1 answer
  • According to the law of conservation of energy, which statement must be
    13·1 answer
  • Which best explains the forces acting on the objects?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!