Answer to Question #118721 in Mechanics | Relativity for nikil

Question #118721
John is riding a bicycle and comes across a hill of height 7.30 m. At the base of the hill, he is traveling at 6.00 m/s. When he reaches the top of the hill, he is traveling at 1.00 m/s. Jonathan and his bicycle together have a mass of 85.0 kg. Ignore friction in the bicycle mechanism and between the bicycle tires and the road.

i) What is the total external work done on the system of Jonathan and the bicycle between the time he starts up the hill and the time he reaches the top? ii) What is the change in potential energy stored in Jonathan’s body during this process?
1
Expert's answer
2020-05-29T09:49:05-0400

i)


"W=0.5m(v_f^2-v_i^2)+mgh"

"W=0.5(85)(1^2-6^2)+(85)(9.8)(7.3)=4590\\ J"

ii)


"\\Delta U=mgh=(85)(9.8)(7.3)=6080\\ J"


Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be the first!

Leave a comment

LATEST TUTORIALS
New on Blog
APPROVED BY CLIENTS