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
victus00 [196]
3 years ago
7

A metal block of mass 235 g rests at a point 2.8 m from the center of a horizontal rotating wooden platform. The coefficient of

static friction between the block and the platform is 0.437. The platform initially rotates very slowly but the rotation rate is gradually increasing. The acceleration of gravity is 9.8 m/s 2 . At what minimum angular velocity of the platform would the block slide away? Answer in units of rad/s.
Physics
1 answer:
Nuetrik [128]3 years ago
5 0

Answer:

ω=1.23 rad/sec

Explanation:

The block will start sliding when the centrifugal force exceeds the force of friction

We have Force of friction and centrifugal force are as under

F_{f}=\mu mg...........(i)\\\\F_{c.f}=m\omega ^{2}r................(ii)

Thus equating the 2 forces to get the minimum angular velocity we have

\fr\mu mg= m\omega^{2}r\\\\\therefore \omega =(\frac{\mu g}{r})^{1/2}

Applying values we get

ω=1.23 rad/sec

You might be interested in
Laminar flow, where water moves in approximately straight-line paths, characterizes ________.
densk [106]

Answer:

b. slow-moving streams.

Explanation:

In Fluid Mechanics, the Reynolds numbers indicates the existence of turbulence in fluid streams. Low Reynolds numbers are related with laminar flow. The Reynolds formula is:

Re = \frac{\rho_{water} \cdot L_{c}}{\mu_{water}} \cdot v

The Reynolds number is directly proportional to fluid speed. Hence, slow-moving streams are a sound example of laminar flow. The correct answer is B.

6 0
3 years ago
For convection to occur,
asambeis [7]

C. Convection is the transfer of energy by the motion of a fluid. Fluids are by definition substances in which particles are able to flow. Hence the answer is c

4 0
3 years ago
A brick falls from a wall to the ground 3.42 m below. How much time will it take to
ddd [48]

Answer:

The time taken by the brick to hit the ground, t = 0.84 s

Explanation:

Given that,

A brick falls from a height, h = 3.42 m

The initial velocity of the brick is zero.

Since the brick is under free-falling. The time equation of a free-falling body when the displacement is given is

                                     t = \sqrt{2h/g}

where,

                                 h - height from surface in meters

                                 g - acceleration due to gravity

on substituting the values in the above equation,

                                 t =  \sqrt{2X3.14/9.8}

                                   = 0.84 s

Hence, time taken by the brick to hit the ground is t = 0.84 s

6 0
3 years ago
In an atomic model that includes a nucleus, negative charge is
NeX [460]
D). located out side the nucleus
7 0
3 years ago
Read 2 more answers
A parcel of land is in the shape of an isosceles triangle. The base has a length of 425 ft.; the other sides, which are of equal
kogti [31]

Answer:

The answer to your question is 636.6 ft    

Explanation:

Data

base = 425 ft

angle = 39°

See the picture below

1.- Divide the triangle to get two right triangles.

    Now the superior angle will measure 19.5° and the opposite side will measure 212.5 ft

2.- Use the trigonometric function sine to find the hypotenuse

     sin 19.5 = 212.5/hyp

solve for hyp

    hyp = 212.5 / sin 19.5

Result

    hyp = 212.5/ 0.333

    hyp = 636.6 ft    

4 0
3 years ago
Other questions:
  • A cleaver physics professor wants to create a situation where a block starts from rest at the top of a 31.0° inclined plane and
    13·1 answer
  • Two point charges of -7uC and 4uC are a distance of 20
    9·2 answers
  • Why are some scientists skeptical of the scientists results and conclusions
    6·1 answer
  • The sun is the centermost star of our solar system. <br> a. True <br> b. False
    11·2 answers
  • HEELLP!!!!!!<br> How many paragraphs do you need for a science fair research paper?
    5·1 answer
  • Four identical capacitors are connected with a resistor in two different ways. When they are connected as in part a of the drawi
    15·1 answer
  • How do biological and environmental factors affect behavior?
    5·1 answer
  • Skater N, 58.9 kg, is moving north at a speed of 7.8 m/s when she collides with Skater E, 72.6 kg, moving east at 3.5 m/s. The t
    14·1 answer
  • Perform the following mathematical operation and report the answer to the correct number of significant figures 143.6/21.2
    12·1 answer
  • Might it be possible to explain the interaction of the rod and pieces of paper as a gravitational interaction? please explain wh
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!