Question

what is stiffness factor

Answer #1

An oscillator follows Hooke’s law with a stiffness factor of 4.2
×× 106 N/m and an effective mass of 43.5 kg. It is set in
motion at t = 0. After 2.0 minutes, the amplitude is only
50% of what it was initially. (a) What is the value of
b/2m for the motion? (b) By what factor does the
frequency, f’, differ from f, the undamped
frequency?

Which of the following statements are true about
modified stiffness?
i. If one end is simply supported, the modified
stiffness factor for the other end is third-quarter of that
member's relative stiffness.
ii. If the one end is symmetrical to the end, then the
factor is equal to its relative stiffness.
iii. If the one end is antisymmetrical to the other,
then the factor is third-halves of its relative stiffness
iv. If the one end is restrained, the stiffness factor...

For
a bolted assembly with six bolts, the stiffness of each bolt is
kb=3 Mlbf/in and the stiffness of the members is km=12 Mlbf/in per
bolt. An external load of 85 kips is applies to the entire joint.
Assume the load is equally distributed to all the bolts. It has
been determined to use 1/2 in-13 UNC grade 8 bolts with rolled
threads. Assume the bolts are preloaded to 75 percent of the proof
load.
a) determine the yielding factor...

What is flexural Rigidity (EI) and stiffness (AE/L)?
What is their significance? When and why does AE/L tend to
infinity? Explain in detail.

A patient presents active rheumatoid arthritis and complains
symptoms of malaise, stiffness, and low-
grade fever. The proteins or cytokines most likely causing these
symptoms are:
IL-4 and IL-10
Rheumatoid factor
Gamma globulin
TNF and IL-1

The stiffness of board A is 124GPa and the weight of the man
is 68kg while the stiffness of board B is 200GPa and the weight of
the man is 70kg. Which of the two people will give the greater
amplitude of oscillation? note that both are at the end of the
diving board.

A 1/4-kg mass is attached to a spring with stiffness 52 N/m.
The damping constant for the system is 6 N-sec/m. If the mass is
moved 3/4 m to the left of equilibrium and given an initial
rightward velocity of 1 m/sec, determine the
equation of motion of the mass y(t) =
and give
its damping factor,
quasiperiod, and
quasifrequency.

Write an expression for the stiffness of an end-loaded
rectangular cantilever beam

Explain the physical meaning of the spring constant in terms of
"stiffness" or "softness" of a spring

In a force-displacement framework, why is stiffness of an
element represented in matrix form?

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