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2. a) 2,8*10^7 mm= 2,8*10^7*0,001=2,8*10^4 m=28000 m ; 1 mm=0,001 m
b) 3 h= 3*60 min*60 s=10 800 s
c) 4*10^-5 t= 4*10^-5*1000 kg=4*10^2 kg=400 kg
3. 1 łut=1/32 funta= 0,4/32=0,0125 kg; 1 funt ok.0,4kg (0,409; 0,4055)
98 kg= 98/0,0125=7 840 łutów
skorupy nie znalazłem
4. g=GM/R^2 ; G[m^3*kg^-1*s^-2]*M[kg^1]*R^-2[m^-2]=[m^(3-2)*kg^(-1+1)*s^-2=[m/s^2]