Physics - Rotation Question with Solution | TestHub
PhysicsRotationMiscellaneousMedium3 minQB
PhysicsMediumsingle choice
Passage / Comprehension
An exercise bike uses a heavy disc wheel. Two friction pads provide a total tangential retarding force of 20 N at 0.3 m from the wheel centre. The kinetic-friction coefficient is 0.4. The odometer distance is the distance travelled by a point 0.3 m from the centre. The pedals move in a circle of radius 0.15 m, and the transmission makes the wheel rotate twice per pedal revolution.
A cyclist's energy consumption rate during the workout is 500 W . If the cyclist wishes to expend at least 300 kcal of energy, how long must the cyclist exercise at this rate ? (Take 1 calorie )
Options:
Answer:
D
Solution:
300 kcal=300000×4.2=1.26×10^6 J.
At 500 W, t=2520 s=42 min.
Stream:JEESubject:PhysicsTopic:RotationSubtopic:Miscellaneous
⏱ 3mℹ️ Source: QB
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