car starts from rest on a half km long bridge. The coefficient of friction between the tyre and the road is 1.0. Show that one can not drive through the bridge in less than 10 s..Concept of Physics - 1 , HC VERMA , Chapter 6:Friction "
Answers
Answered by
38
Solution :
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let the maximum acceleration produced in car be a.
a=μg
a=1x10 =10m/.s²
For crossing of the bridge in minimum time, it has to travel with maximum acceleration.
u=0m/s
s=500m
a=10m/s
a=ut+1/2at²
500=0+1/2 10 t²
t=√100=10 sec
if acceleration is less than 10 m/s2 time will be more than 10 sec.. So one can't drive through the bridge in less than 10sec
****************************
let the maximum acceleration produced in car be a.
a=μg
a=1x10 =10m/.s²
For crossing of the bridge in minimum time, it has to travel with maximum acceleration.
u=0m/s
s=500m
a=10m/s
a=ut+1/2at²
500=0+1/2 10 t²
t=√100=10 sec
if acceleration is less than 10 m/s2 time will be more than 10 sec.. So one can't drive through the bridge in less than 10sec
Answered by
13
Answer:
Explanation:
let the maximum acceleration produced in car be a.
a=μg
a=1x10 =10m/.s²
For crossing of the bridge in minimum time, it has to travel with maximum acceleration.
u=0m/s
s=500m
a=10m/s
a=ut+1/2at²
500=0+1/2 10 t²
t=√100=10 sec
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