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
BaLLatris [955]
3 years ago
9

A dock worker loading crates on a ship finds that a 27 kg crate, initially at rest on a horizontal surface, requires a 80 N hori

zontal force to set it in motion. However, after the crate is in motion, a horizontal force of 56 N is required to keep it moving with a constant speed. The acceleration of gravity is 9.8 m/s 2 . Find the coefficient of static friction between crate and floor.
Physics
1 answer:
Aleksandr-060686 [28]3 years ago
7 0

Answer:0.302

Explanation:

Given

mass of crate m=27 kg

Force required to set crate in motion is 80 N

Once the crate is set  in motion 56 N is require to move it with constant velocity

i.e. 80 N is the amount of force needed to just overcome static friction and 56 is the kinetic friction force

thus  

f_s(static\ friction)=\mu \cdot N

where \muis the coefficient of static friction and N is Normal reaction

N=mg

f_s=\mu mg

\mu mg=80

\mu =\frac{80}{27\times 9.8}

\mu =0.302

You might be interested in
If it takes 150 n of force to accelerate an object at 30 m/s what is the mass of the object
iris [78.8K]
F  =  ma.         

Note Force should  be = 150 N.  Acceleration = 30 m/s2   ( Am presuming for your question you meant to write 30m/s2  and not 30m/s as you wrote)

150 = m ( 30)

150/30  = m.

5 = m

Mass of the object = 5 Kg.
3 0
3 years ago
What is the primary technique for determining the absolute age of rock
jekas [21]
<span>D. measuring radioactive decay of element isotopes </span>
7 0
3 years ago
Bowling ball and a balloon are dropped from a 50 m tall building at the same time. IN AIR which object will hit the ground firs
HACTEHA [7]

It depends, What is the balloon filled with? Just air, heilum, water, etc. If its just air then the bowling ball would most likly hit first, but if the balloon is filled with water it would problably hit at the same time, theres also air resistace to think about is there any or it is almost like a vaccum chamber?

8 0
3 years ago
Globalization concerns many workers because ________.
Cloud [144]
Globalization concerns many workers because companies will tend to seek lower costs by outsourcing labor.
6 0
3 years ago
Read 2 more answers
What is an example of volume
Y_Kistochka [10]
Measuring the Volume of Solids. The volume of solids is expressed in cubic measurements, such as cubic centimeter or cubic meter.
6 0
3 years ago
Other questions:
  • A horse was at rest.what was the final velocity of the horse if it covered 200 meters in 16 seconds?
    14·1 answer
  • A bicycle tire is spinning clockwise at 3.40 rad/s. During a time period Δt = 2.50 s, the tire is stopped and spun in the opposi
    14·2 answers
  • In a system, when energy is transformed from one form to another
    13·2 answers
  • A wave has a frequency of 450 Hz and a wavelength of 0.52 m. What is the
    10·1 answer
  • Suppose you have three springs with force constants of k1 = k2 = k3 = 3.70 x 10^3 N/m. What is their effective force constant if
    15·1 answer
  • Father drove 176 km in 7 hours. For the first 92 km, he spent
    13·1 answer
  • A 2.1 times 103 - kg car starts from rest at the top of a 5.0 - m - long driveway that is inclined at 20 deg with the horizontal
    10·1 answer
  • Two blocks, one of mass 5 kg and the other of mass 2 kg, are attached to opposite ends of a light string and hung vertically fro
    6·1 answer
  • A doctor is examining a child with a red, inflamed ear
    10·1 answer
  • What are the examples of Inertia of motion​
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!