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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionMedium2 minQB

PhysicsMediummultiple choice

A vehicle has metal wheels with $α = 1.2 \times 1 0^{- 5} /^{\circ} C$ . It runs at speed of $20 m / s$ at all the times and covers a distance of 200 km in each run. Its radius is 50 cm at 0°C.

Options:(select one or more)

Answer:

A, D

Solution:

$r^{'} = 0.5 (1 + 1.2 \times 1 0^{- 5} \times 50)$

$r^{'} = 0.5003 m$

$ω = \frac{20}{0.5003} \approx 39.976 rad s^{- 1}$

$θ = \frac{200000}{0.5003} \approx 3.9976 \times 1 0^{5} rad$

Thus A and D hold; C has the wrong factor.

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

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