Part A F= in N Part B F = in N F = in N Express your answer using two significan

Question

Part A F=                               in N Part B F =             in N F = in N Express your answer using two significantfigure. height= 14 Part B What is the average force exerted by the fiston the board if the fist stops abruptly, so the contact time isonly 0.30 title= F= in N Express your answer using twosignificant figures. title= and 0, respectively. Part A What is the average force exerted by the fiston the board if the fist follows through, so the contact time is3.2 For a karate chop, assume that the hand has a mass of0.40 kg and that the speeds of the hand just before and just after hitting the board are 15

Explanation / Answer

    Mass, m = 0.4 kg     Initial speed , V1 = 15 m/s     Final speed, V2 = 0 m/s (a)     Contact time , t = 3.2 ms = 3.2 X 10-3 s     Change in momentum, P = mV      ( where V = change invelocity )       = 0.4 * 15                                            = 6 kg m/s     Force, F = P / t = 6 / ( 3.2 X 10-3 )                                     = 1875 N                              = 18.75 X 10 2 N (b)     Contact time , t = 3.2 ms = 0.3 X 10-3 s     Force, F = P / t = 6 / ( 0.3 X 10-3 )                                    = 20000 N                     = 20 X 103 N

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