問題一覧
1
Ratio of the sliding force required to the weight of the material being pushed. It is the measure of the resistance to the sliding of one material resting on another.
Coefficient of Friction
2
For a force system to be in static equilibrium, the algebraic summation of forces is:
Zero
3
Two forces equal in magnitude but oppositely directed and produce moment is called
Couple
4
A force may be moved anywhere along its line of action without producing a change in external effect. This statement is
True
5
What states the moment of the 2 forces about the same axis.
Varignon’s Theorem
6
In a structure whose material follows hooke’s law and in which the supports are unyielding and the temperature is constant, what law states that the external virtual work done by a system of forces, P. during the deformation caused by a system of forces, Q, is equal to the virtual work done by a system of forces, Q, during the deformation caused by the P forces.
Bett’s Law
7
Snow loads, wind, pressure suction and earthquake loads and the like are what type of loads?
Environmental Loads
8
This states that the external effect of a force on a body is the same for all points of application along its line of action, it is independent of the point of application
Principle of transmissibility of a force
9
Among the following axioms of mechanics, which of the following is incorrect?
A set of forces in equilibrium may be added to any system of forces thus changing the effect of the original system.
10
An elevator cable will have its greatest tension when the elevator car is moving.
Downward but coming to rest
11
Calculate the second moment of area of a rectangular section with base of 50mmm and height of 100mm.
4166667 mm^4
12
These are referred to permanent loads or unmovable loads.
Dead loads
13
13-15 A plane truss as shown in the figure is acted upon by 480N downward load at joint c and E and a 1200 n load at J directed as shown Find the reaction at G.
811 N
14
Find the vertical reaction at A.
1132n
15
Find the force acting on member AH.
2678n
16
It is a type of truss having both vertical and diagonal members between the upper and lower chords, with the diagonals sloping toward the center
Pratt Truss
17
It states that stress is proportional to strain
Hooke’s Law
18
The normal force exerted by a smooth horizontal surface towards a 100-lb block acting on it is
100 lbs
19
It refers to occupancy load which is either partially or fully in place or may not be present at all is called:
Live Load
20
The ratio of unit stress to unit strain
Modulus of elasticity