Solution.
Earth to Sirius=8.7 light-years;
70% of c;
d=6m;
l=25m;
mp=1.673⋅10−27kg;
a)t=vd;
t=0.78.7=12.43years;
b) S=πr2+2πrl;
S=π⋅(3m)2+2⋅π⋅3m⋅25m=159πm2=499.26m2;
h=8.7⋅9.46⋅1015m=8.23⋅1016m;
V=499.26m2⋅8.23⋅1016m=4.108⋅1019m3;
m=D⋅V;
m=1.673⋅10−27kg/m3⋅4.108⋅1019m3=6.87⋅10−8kg;
Answer: a)t=12.43years;
b)m=6.87⋅10−8kg.
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