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
soldi70 [24.7K]
2 years ago
9

A small button placed on a horizontal rotating platform with diameter 0.320 m will revolve with the platform when it is brought

up to a speed of 40.0 rev min, provided the button is no more than 0.150 m from the axis. (a) What is the coefficient of static friction between the button and the platform
Physics
1 answer:
Otrada [13]2 years ago
6 0

Answer:

0.2687 approximately 0.27

Explanation:

Diameter = 0.320

Speed = 40.0 rev/min

We are required to find coefficient of static friction between friction and button

The radius can be calculated as

0.320/2

= 0.160m

Then we have the rotational speed w = 40rev/min x 2pi/60

= 4.19 rad/s

umg = mrw²

u = mrw²/mg

u = rw²/g -------(1)

g = 9.8

When we put values into equation 1

0.150m x 4.19² / 9.8

= 0.150m x 17.5561 /9.8

= 0.2689

This is approximately 0.27

You might be interested in
A patient visited a doctor and complained that from the last 2 months, his urine output is very low. After examination, the doct
Dvinal [7]

Answer:

kidney

Explanation:

thats where your pee goes through

8 0
2 years ago
Read 2 more answers
The speed of a box traveling on a horizontal friction surface changes from vi = 13 m/s to vf = 11.5 m/s in a distance of d = 8.5
ValentinkaMS [17]

The average power supplied to the box by friction while it slows from 13 m/s to 11.5 m/s is 3.24 W.

<h3>Acceleration of the box</h3>

The acceleration of the box is calculated as follows;

vf² = vi² + 2as

a = (vf² - vi²)/2s

a = (11.5² - 13²) / (2 x 8.5)

a = -2.16 m/s²

<h3>Time of motion of the box</h3>

The time taken for the box to travel is calculated as follows;

a = (vf - vi)/t

t = (vf - vi) / a

t = (11.5 - 13) / (-2.16)

t = 0.69 s

<h3>Average power supplied by the friction</h3>

P = Fv

P = (ma)(vf - vi)

P = (1 x -2.16) x (11.5 - 13)

P = 3.24 W

Thus, the average power supplied to the box by friction while it slows from 13 m/s to 11.5 m/s is 3.24 W.

Learn more about average power here: brainly.com/question/19415290

#SPJ1

7 0
1 year ago
A uniform thin rod of length 0.400 m and mass 4.40 kg can rotate in a horizontal plane about a vertical axis through its center.
elixir [45]
The rod has a mass of m = 4.4 kg and a length of L = 0.4 m.
Its polar moment of inertia is
J = (mL²)/12
   = (1/12) * [(4.4 kg)*(0.4 m)²]
   = 0.05867 kg-m²

The mass of the bullet is 0.3 g.
If its velocity is v m/s, then its linear momentum is
P = (0.3 x 10⁻³ kg)*(v m/s)
Its linear momentum perpendicular to the rod is
P*sin(60°) = 2.5981 x 10⁻⁴ v (kg-m)/s

The angular momentum about the center of the rod when the bullet strikes is
T = (2.5981 x 10⁻⁴ v (kg-m)/s)*(0.2 m) = 5.1962 x 10⁻⁵ v (kg-m²)/s

Because the bullet lodges into the end of the rod, the combined polar moment of inertia is
J + (0.3 x 10⁻³ kg)*(0.2 m)² = 0.05867 + 1.2 x 10⁻⁵ = 0.0587 kg-m²
The initial angular velocity is ω = 17 rad/s.

Because angular momentum is conserved, therefore
5.1962 x 10⁻⁵ v (kg-m²)/s = (0.0587 kg-m²)*(17 rad/s)
v = 19204 m/s

Answer:  19204 m/s

5 0
3 years ago
A coin is placed 29 cm from the center of a horizontal turntable, initially at rest. The turntable then begins to rotate. When t
kobusy [5.1K]

Answer:

The coefficient of static friction between the coin and the turntable is 0.51

Explanation:

at the time of the slip:

centripetal force = frictional force

mv^2/r = x*m*980

v^2/r = 980x

x = v^2/980r

  = [(120)^2]/[980*29]

  = 0.51

Therefore, The coefficient of static friction between the coin and the turntable is 0.51

5 0
3 years ago
Separate sheet of paper for your answer.
evablogger [386]

Answer:

I think its B. Please keep in mind that I could be wrong.

Explanation:

4 0
3 years ago
Other questions:
  • The table below shows the distance from the coast of four locations in Florida.
    6·1 answer
  • A disturbance sends ripples across water in a tub. These ripples are an example of a rarefaction
    15·1 answer
  • A spring with spring constant 450 N/m is stretched by 12 cm. What distance is required to double the amount of potential energy
    13·1 answer
  • How much thermal energy does it take to raise the temperature of 3.5 kg of water from 25°C to 46°C? The specific heat of water i
    5·2 answers
  • A well-insulated bucket of negligible heat capacity contains 129 g of ice at 0°C.
    10·1 answer
  • An astronaut is being tested in a centrifuge. The centrifuge has a radius R and, in starting, rotates according to θ = tn, where
    7·1 answer
  • Which vector correctly indicates the direction of centripetal acceleration experienced by the car?
    9·2 answers
  • A hamster in it's ball starts at rest and accelerates to 3ms1 in 6 seconds.
    7·1 answer
  • Explain why the National Grid uses step-up and step-down transformers.
    6·1 answer
  • The amplitude of a standing sound wave in a long pipe closed at the left end is sketched below.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!