3-In mechanics, natural quantities are expressed in terms of three basic quantities approved in the international system of units: (SI Units) are ----- and... a) length, width, height b) length, time, mass c) width, mass, length d) all options 4-One body's reaction to the other occurs perpendicular to the contact surface when the two ---bodies are touched. a) winding b) rough c) smooth d) all options 5- Quantities in the science of statics are classified into two types-and- a) directional and nondirectional b) moment and couple c) moment and resultat d) all options dybala

Q: The parameter COD is: O a. Usually less in value than the ulitmate BOD b. Usually equal in value to…

A: The parameter COD is: a. Usually less in value than the ulitmate BODb. Usually equal in value to…

Q: The torque (N-m), T, delivered by a water turbine depends upon the discharge (m³/s), Q, head (m), H,…

A: The number of terms is 6.

Q: The state of strain at a point in a rectangular block of material using an x-y coordinate system is…

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Q: Materials can have different masses but equal volumes. a. TRUE b. FALSE

A: Density : It is the ratio of mass and volume . Mass : it defines about how much matter an object…

Q: A solid copper rod is of cross-sectional area 15 mm2 and length 2m. Calculate: a)its change in…

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Q: A mathematical expression of stiffness and resistance used in the study of the structural adequacy…

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Q: The figure shows a cutaway view of an assembly in which a solid bronze [G= 6,500 ksi] rod (1) is…

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Q: A uniform beam of weight W is supported by the two rods, the lower ends of which are at the same…

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System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.