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
Arte-miy333 [17]
3 years ago
10

A rotating door is made from four rectangular sections, as indicated in the drawing. the mass of each section is 86 kg. a person

pushes on the outer edge of one section with a force of f = 80 n that is directed perpendicular to the section. determine the magnitude of the door's angular acceleration.
Physics
1 answer:
Drupady [299]3 years ago
8 0
The moment of inertia about the axis will be given by the formula;
 I0=(1/3)mh², where m is the mass of a section and h is the distance to outer edge.
Therefore, with four sections combined the inertia will be;

         4×I0 = (4/3)mh²
But Tor(M)que applied to the door is 
Torque = F × h
Therefore, 
M = I0 × x
x = M/I0   (But M =Fh
  = (Fh)/(4/3 × mh² ( simplifying the equation)
  = 3F/4mh
 but F = 80 N, m= 86 kg and i assume the height is 1.2 m

 Therefore; 
                  = (3×80)/(4×86×1.2)
                  = 0.581 rad/s²

You might be interested in
A floating boat has a weight of 100 N. What is the buoyant force on the boat?
lara31 [8.8K]
If the boat is floating, then it's just sitting there, and not accelerating
up or down.  That means the vertical forces on it must be balanced. 

So if its weight (acting downward) is 100 newtons, then the buoyant
force on it (acting upward) must also be 100 newtons.
4 0
3 years ago
While the change in blank will remain the same during a collision, the force needed to bring an object to a stop can be blank if
Ahat [919]

Explanation :

There are two types of collision i.e. elastic and elastic collision.

  • Elastic collision : In this type of collision, the total momentum and the kinetic energy of the particles remains constant.
  • Inelastic collision : In this type of collision, only the momentum remains constant while there is some loss of kinetic energy occurs.

From Newton's second law,

F = m a

a is the rate of change of velocity.

F=m\dfrac{v}{t}

There is a inverse relation between the force and the time of collision.

The change in <em><u>momentum</u></em> will remain the same during a collision, the force needed to bring an object to a stop can be <em><u>increased</u></em> if the time of the collision is <u><em>decreased</em></u>.

6 0
3 years ago
Read 2 more answers
3. A 40.0-kg wagon is towed up a hill inclined at 18.5 with respect to the horizontal. The tow rope is parallel to the incline a
inn [45]
Force=tension-fg sin ∅
=140-mg sin 18.5
=140-124.35
=15.62N

a=f/m=15.62/40=0.39
now,
v²=u²+2as
=2×0.39×80
v²=62.4
v=7.8m/s
4 0
3 years ago
A golden retriever is sitting in a park when it sees a squirrel. The dog starts running, exerting a constant horizontal force of
oksano4ka [1.4K]

Answer:

284.8 kgm/s

Explanation:

Impulse: This can be defined as the product of force and time of a body. The S.I unit of impulse is N.s mathematically.

Impulse = Force × time

Change in momentum: This is the product of the mass of a body and its change in velocity. The unit of change in momentum is kgm/s.

Mathematically,

momentum = mass×change in velocity

Deduction from newton's second law of motion,

Impulse = change in momentum

Therefore,

Change in Momentum = Force×time

ΔM = F×t................. Equation 1

Where F = force = 89 N, t =time =  3.2 s.

Substitute into equation 1

ΔM = 89×3.2

ΔM = 284.8 kgm/s

Thus the change in momentum = 284.8 kgm/s

8 0
3 years ago
The planets in our solar system all have ______________orbits.
nadezda [96]

Answer:

elliptical

Explanation:

The orbits of the planets are ellipses with the Sun at one focus, though all except Mercury are very nearly circular.

8 0
2 years ago
Other questions:
  • What is the mechanical advantage of the machine?
    8·2 answers
  • A rock is thrown straight down, not dropped, from the roof of a building that is 61 m above the ground. If it takes 3.1 s to rea
    13·1 answer
  • Name a characteristic property of water
    9·2 answers
  • A lion has a mass of 45 kg. Answer the following questions about it, using correct units. a. The lion runs at a speed of 14.2 m/
    14·1 answer
  • A waitperson carrying a tray with a platter on it tips the tray at an angle of 12 degrees below the horizontal. If the gravitati
    11·1 answer
  • Can yall please help me with this?
    14·1 answer
  • The coefficient of static friction between waxed skis and now snow is 0.14. What force will be needed to get a 700 N skier at re
    12·2 answers
  • The wavelengths for visible light rays correspond to which of these options?
    11·2 answers
  • A 4kg brick is dropped from the top of a building whose hight is 30m.what is the velocity with which it reaches the ground​
    5·1 answer
  • A 2300-kg car slows down at a rate of 3.0 m/s2 when approaching a stop sign. What is the magnitude of the net force causing it t
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!