Sysle.dk - Håndarbejdsbutik: Jw 65-52-13: Mønster: Hæklet rund dug ø:50cm *org* - MØNSTER: Strik/Hækl, Duge og Løber - Hæklet*, Runde duge, Runde Duge 40-69cm
40.A tunnel is dug along a chord of the earth at a perpendicular distance R/ 3 from the earth's centre. Assume that wall of the tunnel is frictionless. Find the force exerted by
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