This download link is referred from the post: SGBAU BSc Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university
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B.Sc. Part-II (Semester-IV) Examination
MATHEMATICS
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(Classical Mechanics)
Paper—VIII
Time : Three Hours] [Maximum Marks : 60
Note :— (1) Question No. 1 is compulsory and attempt it once only.
(2) Solve ONE question from each unit.
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- Choose the correct alternative :
- Each planet describes __ having the sun at one of its foci. 1
- An ellipse
- A circle
- A hyperbola
- None of these
- If a bead is sliding along the wire then the constraint is __ . 1
- Holonomic
- Non-holonomic
- Superfluous
- None of these
- For an inverse square law, the virial theorem reduces to __ . 1
- 2T=-nV
- 2T=nV
- 2T=V
- 2T=-V
- The virtual work on a mechanical system by the applied forces and reversed effective forces is . 1
- Zero
- One
- Negative
- None of these
- The shortest distance between two points in a space is . 1
- A circle
- A straight line
- An ellipse
- A parabola
- If H is the Hamiltonian of the system then a generalized coordinate q, is said to be cyclic if . 1
- ≠ 0
- >0
- =0
- <0
- A square matrix A is said to be orthogonal if 1
- A=AT
- AT=A-
- A=A"
- None of these
- The general displacement of a rigid body with one point fixed is a rotation about some axis. 1
- One
- Two
- Three
- None of these
- The sum of the finite rotations depends on the ~ of the rotation. 1
- Degree
- Order
- Both Degree and Order
- None of these
- A particle moving in a space has _ degrees of freedom. 1
- One
- Two
- Three
- Four
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- Each planet describes __ having the sun at one of its foci. 1
UNIT—I
- (a) Derive the lagrange’s equations of motion in the form :
dt| aq aq,
for conservative system from D Alembert’s principle. 6--- Content provided by FirstRanker.com ---
(b) A bead is sliding on a uniformly rotating wire in a force-free space, then show that the acceleration of the bead is ¥=rw?’, where w is the angular velocity of rotation. 4 - (p) Two particles of masses m and m, are connected by a light inextensible string which passes over a small smooth fixed pulley. If m > m,, then show that the common acceleration of the particles is . 5
(q) Obtain the equations of motion of a simple pendulum by using D’Alembert’s principle. 5
UNIT—II
- (a) For a central force field, show that Kepler's second law is a consequence of the conservation of angular momentum. 5
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(b) Prove that if the potential energy is a homogeneous function of degree —1 in the radius vector F. then the motion of a conservative system takes place in a finite region of space only if the total energy is negative. 5 - (p) Prove that in a central force field the areal velocity is conserved. 5
(q) Show that if a particle describes a circular orbit under the influence of an attractive central force directed towards point on the circle, then the force varies as the inverse fifth power of the distance. 5
UNIT—III
- (a) Show that the functional :
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Iy(ol= [ {2y +y (9} dx
defined in the space c [0, 1] is continuous on the function y,(x) = x in the sense of first order proximity. 5
(b) Find the extremals of I[y(x)]= j[yz +y‘2 +2ye*dx . 5 - (p) Find the extremals of the functional :
yeol= [r16y? -y? +x’]ix. 5--- Content provided by FirstRanker.com ---
(q) Write down the Euler-Ostrogradsky equation for the functional :
lztx 1= [ (2) +{ 2| +12a806,y)p dx dy 5
UNIT—IV
- (a) Show that Hamilton’s principle can be derived from D’Alembert’s principle. 5
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(b) Define Hamiltonian H. Derive the Hamilton’s equations for the Hamiltonian H of the system. 1+4 - (p) Deduce the Hamilton’s equations of motion of a particle of mass m in Cartesian coordinates (X, y, 2). 5
(q) Define Routhian, prove that a cyclic coordinate will not occur in the Routhian R. 1+4
UNIT—V
- (a) Prove that if A is any 2 x 2 orthogonal matrix with determinant | A | =1, then A is a rotation matrix. 5
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(b) Define infinitesimal rotation. Prove that infinitesimal rotations commute. 1+4 - (p) Show that two complex eigenvalues of an orthogonal matrix representing a proper rotation are e*®, where ¢ is the angle of rotation. 5
(q) Prove that the general displacement of a rigid body with one point fixed is a rotation about some axis. 5
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This download link is referred from the post: SGBAU BSc Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university