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| Teaching Since: | Apr 2017 |
| Last Sign in: | 453 Weeks Ago, 3 Days Ago |
| Questions Answered: | 402 |
| Tutorials Posted: | 401 |
MSC,MBA(IT)
Standford
Jun-1997 - Sep-2000
IT Manager
Honeywell
Aug-2001 - Present
4/113 The contractor’s ladder jack has welded hooks A and B which fit over the rungs of a vertical ladder and support one end of a scaffold plank. The ho- mogeneous crate and portion of a plank supported by the jack have a combined mass of 84 kg. All of the vertical force is supported by the hook at A, and the three bolts support force but not torque.
40°
40° C
A 5°
F
Calculate the total force supported by the bolt at
D. Compare the vertical component of the force at
E with the vertical component of force supported
O E
75° D
by the hook at A.
150 300 100
mm mm mm
![]()
AO = 4²
![]()
BC = CD = 9²
DE = 3²
Problem 4/111
40
A mm
E
375
mm
4/112 The carpenter builds the square frame ABCD and then braces it with member EF as shown in order to prevent racking (distortion into a rhombic shape) under the applied force P. Determine the tension T in the brace as a function of x. Take all connections to be pin joints. Member DC is firmly fastened to the floor.
D
300
mm
C
B
Problem 4/113
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