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
miskamm [114]
3 years ago
9

A dockworker loading crates on a ship finds that a 26-kg crate, initially at rest on a horizontal surface, requires a 72-N horiz

ontal force to set it in motion. However, after the crate is in motion, a horizontal force of 54 N is required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor. g
Physics
1 answer:
goldenfox [79]3 years ago
6 0

Answer:

Explanation:

A 26-kg crate, initially at rest on a horizontal surface, requires a 72-N horizontal force to set it in motion.

Maximum Frictional force on stationary object  F = μs R  where μs is coefficient of static friction and R is reaction of ground which is equal to weight for object placed on horizontal surface .

F = μs  x mg

Given F = 72 , m = 26

72 = 26 x 9.8 x  μs

μs = .28

Kinetic friction : ---

Frictional force on moving  object  F = μk R  where μk is coefficient of kinetic friction and R is reaction of ground which is equal to weight for object placed on horizontal surface .

F = μk  x mg

Given F = 72 , m = 26

54 = 26 x 9.8 x  μk

μk = .21  

You might be interested in
neptune is an average distance of 4.5×10^12m from the sun. Estimate the length of the Neptunian year.
Vikentia [17]

As per Kepler's third law we know that

\frac{T_1^2}{T_2^2} = \frac{R_1^3}{R_2^3}

now here we know that

T_1 = year of Neptune

T_2 = year of Earth

R_1 = distance of Neptune from Sun

R_2 = Distance of Earth from Sun

so now we will have

\frac{T_1^2}{1} = \frac{(4.5 \times 10^{12})^3}{(1.5 \times 10^11)^3}

T_1^2 = 27000

T_1 = 164.3 years

so length of year of Neptune is 164.3 years

6 0
3 years ago
Chance drives his scooter 7km north he stops for lunch and then drives 5km East to his friend house what distance did he cover
Katena32 [7]

Answer:12km

Explanation:

7km+5km=12km

6 0
3 years ago
Kayla drew two ray diagrams to compare the behavior of light rays.
Naddika [18.5K]

The answer is the last option

Explanation:

8 0
4 years ago
Read 2 more answers
As the particles in a soup reach the bolling point what happens
ICE Princess25 [194]

Answer:

Once the particles of a liquid reach its boiling point, additional heat would cause the liquid particles to boil off or vaporize.

Explanation:

4 0
3 years ago
Which statement regarding sound traveling in air is correct?
nikdorinn [45]

Answer: D. A wave with a shorter wavelength is always faster than one with a longer wavelength

Explanation: "Imagine two sets of waves that have the same speed. <u><em>If one set has a longer wavelength, it will have a lower frequency (more time between waves). If the other set has a shorter wavelength, it will have a higher frequency</em></u> (less time between waves). Light moves even faster AND has shorter wavelengths."

Why it's not C: "The number of complete wavelengths in a given unit of time is called frequency (f). <em><u>As a wavelength increases in size, its frequency and energy (E) decrease</u></em>. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer."

Why it's not B: "The frequency does not change as the sound wave moves from one medium to another. Since the speed changes and the frequency does not, the wavelength must change."

Why it's not A: "Do loud sounds travel faster than soft sounds? No. Both travel at the same speed The speed depends on the medium it passes through. Louder sounds are simply sound waves with higher amplitude traveling at the same speed."

6 0
4 years ago
Other questions:
  • A cylinder with moment of inertia I about its center of mass, mass m, and radius r has a string wrapped around it which is tied
    5·1 answer
  • How much work is done on an object if 10 newtons of force are applied to the object and it moves 2 meters?
    12·1 answer
  • Similarities in tennis and volleyball
    13·1 answer
  • Which of these types of electromagnetic radiation has the lowest energy? _____
    5·2 answers
  • An object with a mass of 21 kilograms is lifted through a distance of 7 meters how much work is done
    15·1 answer
  • PLZ HELP
    7·1 answer
  • What is the momentum of an object with mass 8 kg and velocity 5 m/s
    6·1 answer
  • HELP ITS FOR SCIENCE
    8·2 answers
  • Explain the difference in how particles are arranged in a solid,liquids and gases
    15·2 answers
  • What type of meter is connected in
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!