Problem Statement
A smooth rod rotates in a horizontal plane with constant angular velocity $\omega$ about one end. A bead of mass $m$ can slide freely along the rod. At $t=0$, the bead is at distance $r_0$ from the axis with radial velocity $\dot{r}_0 = 0$. Find $r(t)$.
Given Information
- All quantities, constants, and constraints stated in the problem above
- Physical constants used as needed (see Concepts section)
Physical Concepts & Formulas
This problem draws on fundamental physical principles. The key is to identify which conservation law or field equation governs the system, then apply it systematically. Dimensional analysis can always be used to verify that the final answer has the correct units. Working from first principles — rather than memorising formulas — builds deeper understanding and allows tackling novel problems.
- Identify the relevant physical law (Newton’s laws, conservation of energy/momentum, Maxwell’s equations, etc.)
- State the mathematical form of that law as it applies here
- Check dimensions at every step: both sides of an equation must have the same units
Step-by-Step Solution
Problem Statement
A smooth rod rotates in a horizontal plane with constant angular velocity $\omega$ about one end. A bead of mass $m$ can slide freely along the rod. At $t=0$, the bead is at distance $r_0$ from the axis with radial velocity $\dot{r}_0 = 0$. Find $r(t)$.
Given Information
- All quantities, constants, and constraints stated in the problem above
- Physical constants used as needed (see Concepts section)
Physical Concepts & Formulas
This problem draws on fundamental physical principles. The key is to identify which conservation law or field equation governs the system, then apply it systematically. Dimensional analysis can always be used to verify that the final answer has the correct units. Working from first principles — rather than memorising formulas — builds deeper understanding and allows tackling novel problems.
- Identify the relevant physical law (Newton’s laws, conservation of energy/momentum, Maxwell’s equations, etc.)
- State the mathematical form of that law as it applies here
- Check dimensions at every step: both sides of an equation must have the same units
Step-by-Step Solution
Problem Statement
A smooth rod rotates in a horizontal plane with constant angular velocity $\omega$ about one end. A bead of mass $m$ can slide freely along the rod. At $t=0$, the bead is at distance $r_0$ from the axis with radial velocity $\dot{r}_0 = 0$. Find $r(t)$.
Given Information
- Rod angular velocity: $\omega$ (constant), initial position: $r_0$, initial radial velocity: $0$
Physical Concepts & Formulas
In the rotating frame, centrifugal force $m\omega^2 r$ drives the bead outward. The equation of motion is $\ddot{r} = \omega^2 r$, which has exponential solutions.
Step-by-Step Solution
Step 1 — ODE: $\ddot{r} = \omega^2 r$
Step 2 — General solution: $r(t) = A e^{\omega t} + B e^{-\omega t}$
Step 3 — Apply initial conditions: $r(0) = r_0$: $A+B = r_0$. $\dot{r}(0) = 0$: $A\omega – B\omega = 0 \Rightarrow A = B = r_0/2$.
$$r(t) = r_0\cosh(\omega t)$$
Answer
$$\boxed{r(t) = r_0\cosh(\omega t)}$$
Physical Interpretation
The bead’s distance grows as $\cosh(\omega t)$: exponentially at large times. Starting from rest at $r_0$, the bead flies outward ever faster. The centrifugal force increases with $r$, creating positive feedback. This is why beads always fly off spinning rods — there’s no stable equilibrium at finite $r$ without a constraining force.
Worked Calculation
Substituting all given numerical values with their units into the derived formula:
$$\text{Numerical result} = \text{given expression substituted with values}$$
Answer
$$\boxed{\boxed{r(t) = r_0\cosh(\omega t)}}$$
Physical Interpretation
The answer should be checked for dimensional consistency and physical reasonableness: is the magnitude in the expected range for this type of problem? Does the answer change in the correct direction when parameters are varied (e.g., increasing mass should increase momentum, increasing distance should decrease field strength)? These sanity checks are as important as the calculation itself.
Worked Calculation
Substituting all given numerical values with their units into the derived formula:
$$\text{Numerical result} = \text{given expression substituted with values}$$
Answer
$$\boxed{\boxed{\boxed{r(t) = r_0\cosh(\omega t)}}}$$
Physical Interpretation
The answer should be checked for dimensional consistency and physical reasonableness: is the magnitude in the expected range for this type of problem? Does the answer change in the correct direction when parameters are varied (e.g., increasing mass should increase momentum, increasing distance should decrease field strength)? These sanity checks are as important as the calculation itself.
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