Related Questions

The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)
A $$\frac{{{\text{P}}l{\text{A}}}}{{\text{E}}}$$
B $$\frac{{{\text{P}}l}}{{{\text{AE}}}}$$
C $$\frac{{\text{E}}}{{{\text{P}}l{\text{A}}}}$$
D $$\frac{{{\text{AE}}}}{{{\text{P}}l}}$$
Pressure drag does not depend upon the
A Roughness of surface of the body
B Pressure of main flow only
C Length of the body in flow direction
D All of the above
In which of the following body shapes, the pressure drag is large compared to the friction drag?
A Stream line body
B Two dimensional body
C Bluff body
D None of these
If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.
A Change
B Does not change
C Changes periodically
D None of these
If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,
A P + ma = 0
B P - ma = 0
C P × ma = 0
D $$\frac{{\text{P}}}{{{\text{ma}}}} = 0$$
A single force and a couple acting in the same plane upon a rigid body
A Balance each other
B Cannot balance each other
C Produce moment of a couple
D Are equivalent
In which of the following the friction drag is generally larger than pressure drag?
A a circular disc or plate held normal to flow
B a sphere
C a cylinder
D an airfoil
The ratio of wall drag to total drag in the Stoke's law range is
A 0.5
B 1
C $$\frac{1}{3}$$
D $$\frac{2}{3}$$
The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is
A 0.5
B 1
C 2
D 0.33
গ্রেডিয়েন্ট মধ্যবিন্দুর অবস্থান নির্ধারণ করা যায়-i. নির্ধারণীসূচক সংখ্যা লিখেii. আইকনটি ডানে বায়ে drag করে iii. মুক্ত টুলের সাহায্যে drag করেনিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii

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