FYKOS Year 30 Series 1 Problem 2 — Breaking · FYKOS 30 #30.1.2

Physics · mechanics

Problem

Petr likes to ride a bike on a flat road with a speed v=10  m⋅s−1v=10\;\mathrm{m}\cdot \mathrm{s}^{−1}, and his smart bike tells him that his average power is P=100WP=100W. After an accident, his breaks are bent and they now persistently act on a wheel with a friction force Ft=20NF_{t}=20N near the circumference. For how long (t′)t′) he needs to cycle now (with the same speed v)v), to do the same amount of work as before, in time t?t?

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