Physics - Heat & Thermo Question with Solution | TestHub
PhysicsHeat & ThermoThermodynamics Laws & Specific Heats of GasesMedium2 minQB
PhysicsMediumstatement
Statement I: When a cyclist freewheels down a slope at constant speed, braking, the brakes get hot.
Statement II: The heat comes from the gravitational potential energy lost.
Options:
Answer:
A
Solution:
At constant speed, kinetic energy is unchanged. The lost potential energy is dissipated as heat in the brakes. Both are true. A.
Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermodynamics Laws & Specific Heats of Gases
⏱ 2mℹ️ Source: QB
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