Q6. The frame is made from pin-connected members, and is supported by pins at point A and C. The frame is subjected to a uniformly distributed load with load
intensity w = 209 lb/ft, and the lengths are 11 = 3.0 ft and 12 = 5.1 ft. The horizontal
member AB is a hollow square pipe, and it has the cross section as shown, with outer
dimension do - 2.2 in, and inner dimension d; = 1.7 in. Determine the magnitude of
maximum bending stress at point D, in the unit of ksi.
W
k do
D
B
di
1.5 ft
A
E
4 ft
2.5 ft
11
12

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Manometers are good examples of measuring instruments, nowadays they are not as common as before. a)-capacitive probe gauges b)-gravitational gauges deformation ) gauges d)-digital gauges

Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.