Tutor profile: Ankush K.
Subject: Applied Mathematics
What is the physical significance of Curl of a velocity vector?
The curl of the velocity vector represents the vorticity in the fluid flow. If Curl of the velocity vector is zero, the flow is said to be an irrotational flow.
Subject: Mechanical Engineering
Is that possible to have a strain without stress?
Yes, for example, if the member is experiencing a load in the y-direction (which in turn causes stress in the y-direction), the Hooke's Law shows that strain in the x-direction does not equal to zero. This is because as the material is being pulled outward by the y-plane, the material in the x-plane moves inward to fill in space once occupied, just like an elastic band becomes thinner as you try to pull it apart. In this situation, the x-plane does not have any external force acting on them but they experience a change in length. Therefore, it is valid to say that strain exists without stress in the x-plane.
Subject: Aerospace Engineering
What are the forces acting on an aircraft?
There are three types of forces: 1. Aerodynamic Forces (Lift and Drag) 2. Propulsive Force (Thrust) 3. Gravitation Force (Weight)
needs and Ankush will reply soon.