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Exercice 8 p 90

Exercice 11 p 91

a. P = 3,2N

b. $m = \frac P g$

P en N

g en N/kg

m en kg

$m = \frac {3,2} {9,8} = 0,33~kg = 330~g~environ$

Exercice 13 p 91

$g = \frac P m$

P en N

m en kg

g en N/kg

$g = \frac {9990} {900} = 11,1 N/kg$

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