1.19×10^(-3) lb/m 8.84×10^3 km cable kg

1.19×10^(-3) lb/m 8.84×10^3 km cable kg

 

 

International computer communications are often carried by optical fibers in cables laid along the ocean floor. If one strand of optical fiber weighs 1.19×10^(-3) lb/m, what is the total mass (in kg) of a cable made of six strands of optical fiber, each long enough to link New York and Paris (8.84×10^3 km)?

 

 

 

(8.84×10^3 km) (1000 m / 1 km) (1.19×10^(-3) lb/m) (1 kg / 2.205 lb)

= (8.84×10^3) (1000) (1.19×10^(-3)) (1 / 2.205)

= 4770.79365 kg

---> 광섬유 한 가닥의 질량

 

 

 

6 × 4770.79365 kg

= 28624.7619 kg

 

 

 

답: 2.86×10^4 kg

 

 

 

 

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