Compute the coefficient of friction at block, Mechanical Engineering

Compute the coefficient of friction at block:

The frame shown in Figure rotates about a vertical axis. The coefficient of friction under block A is 0.4. Compute the coefficient of friction at block B if B starts to rise when the frame rotates at 40 rpm.

1885_Compute the coefficient of friction at block.jpg

Solution

As the table rotates, block A shall try to move outwards.

We have,        ω = (40 × 2 π )/60

                       = 4.19 rad / sec

The acceleration acting on Block A towards axis of rotation shall be

r ω2 = 21.06 m / sec2            (r = 1.2 m)

let FBD of Block A (Figure (b)), writing equilibrium equation, we have

T =   (100/g )  × an  - F

We get,

T = (100 /g) × an - 0.4 F1

= (100 /9.81) × 21.06 - 0.4 × 100

= 174.67 N

Now considering FBD of Block B, (Figure (c)).

Figure 6.15(c)

We get,

T = 80 + (80 /9.81) × 21.06 × μ

 ∴ μ = (174.67 - 80)/171.74

= 0.55

Posted Date: 1/29/2013 2:42:24 AM | Location : United States







Related Discussions:- Compute the coefficient of friction at block, Assignment Help, Ask Question on Compute the coefficient of friction at block, Get Answer, Expert's Help, Compute the coefficient of friction at block Discussions

Write discussion on Compute the coefficient of friction at block
Your posts are moderated
Related Questions
Inlet and Exhaust Valves : Valves are commonly mushroom shaped poppet type. They are provided on the cylinder for regulation of the charge coming into the cylinder (inlet valve)


Necessity of Brakes To stop a vehicle in normal as well as emergency conditions. To slow down the speed to turn, pass hurdles etc.

Q. Explain about Ducts and Flues in steam generators? All air ducts and gas flues connecting the forced draft fan, fan intake silencer, preheater, and transition piece at the g


This components extensively used teh specialized and / or general purpose software. Often it may development for typical application and to perform calculations in the design

Derive mathmatical equation for Bernoull's equation, what are the application of Bernoull's equation and illustrate any one.


Calculate the Horizontal and Vertical Components A jet aircraft pulls up into a vertical curve as shown in the figure. As it passes the position where Θ = 30°, its speed is 10

What is the difference between blowholes & porosity in casting ?