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
Sonbull [250]
3 years ago
10

10 points

Physics
1 answer:
e-lub [12.9K]3 years ago
4 0

Answer:

e = 0.46 m

Explanation:

From the laws of friction, frictional force, F is proportional to normal reaction, R.

F₁ = μR

where μ is coefficient of friction; R = mg and g = 9.8 ms⁻²

Also, from Hooke's law, extension, e, in an elastic spring is proportional to applied force.

F₂ = Ke

where K is force constant of the spring

Since the box is just about to move, the coefficient of friction involved is static friction.

The force on the spring equals the frictional force experienced by the box the box; F₁ = F₂

Ke = μR

e = μR/K

where μ = 0.65; R = 18 kg * 9.8 ms⁻²; K = 250 N/m

e = (0.65 * 18 * 9.8)/250

e = 0.46 m

You might be interested in
How were Jupiter, Saturn, Uranus, and Neptune formed?
larisa [96]

Explanation:

They were formed by accretion

3 0
3 years ago
Read 2 more answers
You can see stars brighter than magnitude +6 with your naked eye under dark sky conditions, and you can also see the full moon a
Mariana [72]
-6 uh 89 0 -+= 62 uwuwhhiwhiuhwiuhwuihhishishoknsk
6 0
3 years ago
The big bang theory has finally answered one of the biggest questions of science—the origin of the universe.
ss7ja [257]

Answer:

False

Explanation:

According to the big bang theory, matter was an infinitely small and very high density point which at one point exploded and expanded in all directions, creating what we know as our Universe, which also includes space and time . This happened about 13.8 billion years ago. Theoretical physicists have managed to reconstruct this chronology of events from 1/100 of a second after the Big Bang. After the explosion, while the Universe expanded, it cooled sufficiently and the first subatomic particles were formed: Electrons, Positrons, Mesons, Barions, Neutrinos, Photons among others. Today more than 90 particles are known. This theory solves many unknowns and is very well received by the scientific community, however there is still much to solve, for example, one of the great unsolved scientific problems in the expanding Universe model is whether the Universe is open or closed.

An attempt to solve this problem is to determine if the average density of matter in the Universe is greater than the critical value in Friedmann's model. The mass of a galaxy can be measured by observing the movement of its stars; multiplying the mass of each galaxy by the number of galaxies, it is seen that the density is only 5 to 10% of the critical value.

6 0
3 years ago
A device that changes mechanical energy to electrical energy by rotating a coil of wire through a magnetic field is called a(an)
tigry1 [53]
A device that changes mechanical energy to electrical energy by rotatin a coil of wire through a magnetic field is called B. Generator
4 0
3 years ago
Read 2 more answers
Which calculates the intensity of an electric field at a point where a 0.50 C charge experiences a force of 20. N?
tester [92]

Answer: 40\ N/C

Explanation:

Given

Magnitude of charge is q=0.5\ C

Force experienced is F=20\ N

Electric field intensity is the electrostatic force per unit charge

\therefore E=\dfrac{F}{q}\\\\\Rightarrow E=\dfrac{20}{0.50}\\\\\Rightarrow E=40\ N/C

Thus, the electric field intensity is 40\ N/C

6 0
3 years ago
Other questions:
  • Consider a system to be one train car moving toward another train car at rest. When the trains collide, the two cars stick toget
    8·2 answers
  • Do the moon rotate counterclockwise
    12·1 answer
  • Max is gearing up for her lacrosse match. What safety measures can help Max stay safe for the big event?
    10·1 answer
  • The Celsius tempersture scale is based on which of the following? a) vapor b) the human body c) the boiling point of air d) the
    13·2 answers
  • What activity would require more impulse?
    7·1 answer
  • Developing
    9·1 answer
  • HELPPPPPPPPPPPPPPPPPP OMGGGGGGGGGGGGGGGGGGGGGGG
    9·1 answer
  • If neutron stars are squeezed harder they collapse into black hole; how would this transition occur?
    15·1 answer
  • Suppose two children push horizontally, but in exactly opposite directions, on a third child in a wagon. The first child exerts
    10·1 answer
  • What direction would the north pole of a bar magnet point if you were to hang the bar magnet from a thin string?.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!