Subtopic: Lagrangian & Hamiltonian Dynamics & Special Relativity
Question Statement:
The Hamiltonian for a one dimensional system with mass m, position q and
momentum p is H(p, q) =
p2
2m + q2A(q), where A(q) is a real function of q. If
m
d2q
dt2 = -5qA(q), then
dA(q)
dq = n
A(q)
q . The value of n (in integer) is ______
Official Answer Key:
2.5
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE PH 2025 Q.62)**
**1. Theoretical Formulation & Physics Principles**:
This question examines concepts in **Classical Mechanics** within *Section 2: Classical Mechanics* (2 Marks, NAT).
**2. Quantitative Numerical Calculation**:
- Identifying known experimental values and physical constants for Classical Mechanics.
- Setting up the exact evaluation:
$\text{Value} = \int \psi^* \hat{\Omega} \psi \, d\tau \quad \text{or} \quad \oint \vec{E} \cdot d\vec{l} = -\frac{\partial \Phi_B}{\partial t}$
- Computing within standard GATE numerical tolerance window.
**3. Final Answer**:
Official numerical answer is **2.5**.
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