a steel rod of length 0.5 Km is used in the construction of a bridge . It has to with stand a temperature change of 40 degree celsius .what is the gap that is allowed for its expansion.(a=10-6/ºC)
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8
Average speed = Total Distance / Total Time
S1 = 50 km/hr T1 = 0.5 hr
D1 = S1 x T1 = 50 x 0.5 = 25 km
S2 = 30 km/hr T2 = 0.26 hr
D2 = S2 x T2 = 30 x 0.26 = 7.8 km
S3 = 70 km/hr T3 = 0.76 hr
D3 = S3 x T3 = 70 x 0.76 = 53.2 km
Total Distance = D1 + D2 + D3 = 25 + 7.8 + 53.2
Total Distance = 86 km
Total Time = T1 + T2 + T3 = 0.5 + 0.26 + 0.76
Total Time = 1.52 hr
Average Speed = 86/1.52
Average Speed = 56.58 km/hr
Answered by
1
Answer:
20 mm
Explanation:
use thermal epansion equations and formulae
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