Please put all ansers to three signifigant figures. Thanks! TOWING his sleeping

Question

Please put all ansers to three signifigant figures. Thanks!

TOWING his sleeping quarters behind him in a compact trailer, an eighteen-year-old cyclist of Menominee. Mich., recently traveled nearly 1,200 miles to Boston, Mass., economically and comfortably. Post cards that he sold to curious spectators paid for his supplies during the fourteen-day journey. Streamline in shape, the sturdy trailer is a homemade product of his own design. He is shown above demonstrating his sleeping quarters to an admiring hotel doorman. Use this information:v_Avg = 9.00 m/s, Chet's average cruising speed when he's riding his bike. P_Avg = 190. W, Chet's average power exertion rate p_Max = 900. W, Chet's maximum power exertion rate m = 220. kg, the mass of Chet, his bike, and his camper What is the average force (including friction, air-resistance, etc.) that Chet must push against? (At his cruising speed.) When peddling at maximum power, how much time will it take for Chet to increase his speed from zero to his cruising speed (V_Avg)?

Explanation / Answer

A)

Pavg = 190 W

Favg = ?

Vavg = 9 m/s

Pavg = Favg Vavg

190 = 9 Favg

Favg = 21.1 N

B)

Pmax = 900 W

Vavg = 9 m/s

Fmax = Pmax /Vavg = 900/9 = 100 N

acceleration = a = Fmax /m = 100 / 220 = 0.45 m/s2

Vi = initial velocity = 0

Vf = final velocity = 9 m/s

Using the equation

Vf = Vi + at

9 = 0 + 0.45 t

t = 20 sec

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