Strength of Materials The resultant of the following three couples 20 kg force, 0.5 m arm, + ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be 20 kg, + ve sense 10 kg, - ve sense 10 kg, + ve sense 20 kg, - ve sense 20 kg, + ve sense 10 kg, - ve sense 10 kg, + ve sense 20 kg, - ve sense ANSWER DOWNLOAD EXAMIANS APP
Strength of Materials A number of forces acting at a point will be in equilibrium if All of them are inclined equally Sum of resolved parts in any two perpendicular directions are both zero Their total sum is zero Two resolved parts in two directions at right angles are equal All of them are inclined equally Sum of resolved parts in any two perpendicular directions are both zero Their total sum is zero Two resolved parts in two directions at right angles are equal ANSWER DOWNLOAD EXAMIANS APP
Strength of Materials The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of balance of force forces resolution of forces. independence of forces balance of force forces resolution of forces. independence of forces ANSWER DOWNLOAD EXAMIANS APP
Strength of Materials If a number of forces act simultaneously on a particle, it is possible To replace them by a single force through C.G. To replace them by a single force To replace them by a couple Not a replace them by a single force To replace them by a single force through C.G. To replace them by a single force To replace them by a couple Not a replace them by a single force ANSWER DOWNLOAD EXAMIANS APP
Strength of Materials The effort required to lift a load W on a screw jack with helix angle a and angle of friction Wtan(a-<)>) Wcos(a + ) Wsin(a + <(>) Wtan(a + <)>) Wtan(a-<)>) Wcos(a + ) Wsin(a + <(>) Wtan(a + <)>) ANSWER DOWNLOAD EXAMIANS APP
Strength of Materials A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if the floor and wall both are smooth surfaces the floor is rough, the wall is smooth the floor is smooth, the wall is rough the floor and wall both are rough sur-faces the floor and wall both are smooth surfaces the floor is rough, the wall is smooth the floor is smooth, the wall is rough the floor and wall both are rough sur-faces ANSWER DOWNLOAD EXAMIANS APP
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