Back to ‘Energy & Work’ on 1 A soccer player kicks a 0.446 kg soccer ball up a hill at 24.4 m/s. How high up the hill will i

Question

Back to ‘Energy & Work’
on 1
A soccer player kicks a 0.446 kg soccer ball up a hill at 24.4 m/s. How high up the hill will it roll?
mplete
out of
Answer:
Check
question

in progress 0
Bình An 6 months 2021-08-24T12:53:00+00:00 1 Answers 0 views 0

Answers ( )

    0
    2021-08-24T12:54:45+00:00

    Answer:

    Explanation: Two possible solutions

    in the absence of friction

    mgh = ½mv²

    h = v²/2g = 24.4²(2(9.81) = 30.344…  = 30.3 m

    if enough rolling friction exists to keep the ball from sliding, but ignoring air resistance and assuming the ball is already rolling smoothly at the start

    mgh = ½mv² + ½Iω²

    mgh = ½mv² + ½((2/3)mR²)(v/R)²

    2gh = v² + (2/3)v²

    2gh = (5/3)v²

    h = (5/6)v²/g

    h = (5/6)24.4²/9.81 = 50.5742 = 50.6 m

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )