Question

Select right answer. A rotating steel flat disk has 200 mm inner diameter and 300 mm outer diameter. If the maximum shear stress is to not exceed 200 MPa the allowable speed in rpm is around

Answer #1

A cylindrical tank is made of A36 steel and has an inner
diameter of 1.5 meters. Using Maximum Shear Stress Theory and a
Factor of Safety of 2 with respect to the yield, determine the
minimum wall thickness (mm) required:

WITH COMPLETE SOLUTION
A welded steel girder having the cross section of two
fabricated 280 mm x 25 mm flange and a 600 mm x 15 mm web plate.
The plates are joined by four fillet welds that run continuously
for the length of the 6 m span girder. Each weld has an allowable
load of 330 kN/m.
1.Determine the maximum allowable shear force V for the girder
in kN.
2. Calculate the maximum bending stress of the girder if...

A solid alloy shaft of 50 mm diameter is coupled in series with
a hollow steel shaft of same external diameter. Determine the
internal diameter of the hollow steel shaft if the angle of twist
per unit length in hollow shaft is 75% of that of the solid alloy
shaft. Also, determine the speed at which the compound shaft must
be driven to transmit 200 kW, if the limiting shear stresses are 55
MPa and 75 MPa in alloy and...

A solid steel shaft, 20 mm in diameter and 1 m long, is placed
concentrically inside a hollow
duralumin shaft with inside and outside diameters of 30 mm and
33 mm respectively and a
length of 500 mm. The ends of the hollow shaft are rigidly fixed
to the solid shaft. Determine
(a) the torsional stiffness of the composite shaft
(b) the maximum torque to which the composite shaft may be
subjected if the allowable
shear stresses for steel and...

10. A cast iron wheel of mean diameter 3 metre has six
arms of elliptical section. The energy to be stored
in it is 560 kN-m when rotating at 120 r.p.m. The speed of the mean
diameter is 18 m/s. Calculate the
following:
(a)Assuming that the whole energy is stored in the rim, find the
cross-section, if the width is 300 mm.
(b)Find the cross-section of the arms near the boss on the
assumption that their resistance to bending
is...

A steel piano wire (Y = 200 GPa) has a diameter of 0.780 mm. At
one end it is wrapped around a tuning pin of diameter 8.00 mm. The
length of the wire (not including the wire wrapped around the
tuning pin) is 66.0 cm. Initially, the tension in the wire is 379
N. To tune the wire, the tension must be increased to 407 N.
Through what angle must the tuning pin be turned?
(θ = answer°)

Consider an aluminum annular disk with an outer radius 63.2 mm
and inner radius 7.9 mm. The mass of the disk is 464 grams.
The disk is allowed to rotate on a frictionless table with the
rotation axis at its center. The disk has a small pulley rigidly
mounted at the top concentrically. The pulley's radius is 12.1 mm,
and the mass of the pulley is negligible. A string is wrapped
around the pulley, and a hanging mass of 19.3...

A steel piano wire (Y = 200 GPa) has a diameter of 0.790 mm. At
one end it is wrapped around a tuning pin of diameter 8.00 mm. The
length of the wire (not including the wire wrapped around the
tuning pin) is 66.0 cm. Initially, the tension in the wire is 381
N. To tune the wire, the tension must be increased to 413 N.
Through what angle must the tuning pin be turned?

The A-36 steel pipe in (Figure 1) has a 6061-T6 aluminum core.
It is subjected to a tensile force of 200 kN k N . The pipe has an
outer diameter of 96 mm m m and an inner diameter of 86 mm m m .
For A-36 steel, Est=200GPa E s t = 200 G P a , and for 6061-T6
aluminum, Eal=68.9GPa E a l = 68.9 G P a . A)Determine the average
normal stress in the...

A large wooden turntable in the shape of a flat uniform disk has
a radius of 1.65 m and a total mass of 135 kg. The turntable is
initially rotating at 3.10 rad/s about a vertical axis through its
center. Suddenly, a 65.5-kg parachutist makes a soft landing on the
turntable at a point near the outer edge.
(a) Find the angular speed of the turntable after the
parachutist lands. (Assume that you can treat the parachutist as a
particle.)...

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