A 60 k g bicyclist rides his 9.8 k g bicycle with a speed of 15 m / s Part A How
ID: 2140981 • Letter: A
Question
A 60 kg bicyclist rides his 9.8 kg bicycle with a speed of 15 m/s Part A How much work must be done by the brakes to bring the bike and rider to a stop? Express your answer using two significant figures. W = J Part B How far does the bicycle travel if it takes 4.5s to come to rest? Express your answer using two significant figures. ?x = m Part C What is the magnitude of the braking force? Express your answer using two significant figures. |F| = N A 60 kg bicyclist rides his 9.8 kg bicycle with a speed of 15 m/s Part A How much work must be done by the brakes to bring the bike and rider to a stop? Express your answer using two significant figures. W = J A 60 kg bicyclist rides his 9.8 kg bicycle with a speed of 15 m/s Part A How much work must be done by the brakes to bring the bike and rider to a stop? Express your answer using two significant figures. W = J W = J W = J Part B How far does the bicycle travel if it takes 4.5s to come to rest? Express your answer using two significant figures. ?x = m Part B How far does the bicycle travel if it takes 4.5s to come to rest? Express your answer using two significant figures. ?x = m ?x = m ?x = m Part C What is the magnitude of the braking force? Express your answer using two significant figures. |F| = N Part C What is the magnitude of the braking force? Express your answer using two significant figures. |F| = N |F| = N |F| = N W = JExplanation / Answer
W = ?K ;
W = 1/2 mv^2 ;
W = 0.5 * ( 60+9.8 ) 15^2
W = 7852.5 J <-------ans
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