29.41995008592 Newtons
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Short answer 1.3 x 102 N (on moon) 7.5 x 102 N (on Earth if g = 9.80 N/kg Long Answer Since the category is "The Moon" gravity will be assumed to be 1.63 m/s2 (N/kg = m/s2) http://en.wikipedia.org/wiki/Gravitation_of_the_Moon W = mg W = (77 kg)(1.63 N/kg) = 125.51 -> 1.3 x 102 N (significant figures) for earth, just substitute in 9.80 N/kg for 1.63 N/kg W = (77 kg)(9.80 N/kg) = 7.5 x 102 N
Mass (kg) x Gravitational Field Strength (Gravity) (N/kg) = Weight (N)GFS on earth = 10 N/kg
20 N = 2.039432419999761 kg
9 kg - 3 kg = 6
1 MPa = 1000000 N/m2 and 1 N = 1 kg*m/s2