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
Q. Explain the procedure of Rockwell hardness tests? Rockwell hardness tests per ASTM of the deposited weld, and heat affected zone shall be required for procedure qualificatio

Q. Describe about Chain-wire and tape gauges? Chain, wire and tape gauges are fixed on structures like bridges and the weight is lowered to touch the water surface. Movable sti

I am am Mtech student of Machine design and I am willing to join some core companies so is this the right time for learning some software''s if yes which are they...

Explain in detail about the Large excavations Large excavations required for construction of rafts may need dewatering, depending on the ground water flow and the choice of  a

Advantages of Laser Welding Process   1) Narrow deep penetration welds capable of being produced in atmosphere. 2) Low thermal distortion - due to less heat input and paral



Q. What is Warm extrusion? • Warm extrusion is done above room temperature, but below the recrystallization temperature of the material the temperatures ranges from 424 to 975

Classification Based on Type of Welding  Fusion welding : These processes involve fusion of the base metal to complete the weld. Fusion welds generally  do  not  require  thea

Determine net work done: 5 m 3   of air at 2bar, 27 0 C is compressed to 6bar pressure following PV 1. 3   = constant. It is expanded subsequently adiabaticall