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CGPET 2018 Solved Paper
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© examsnet.com
Question : 15
Total: 150
A car moves at a speed of
36
k
m
∕
h
on a level road. The coefficient of friction between the car tyres and the road is
0.8
.
The car negotiates a curve of radius
R
. If
g
=
10
m
s
−
2
, the car will skid (or slip) while negotiating the curve, if the value of
R
is
20
m
14
m
12
m
50
m
Validate
Solution:
Given,
v
=
36
k
m
∕
h
=
10
m
∕
s
,
µ
s
=
0.8
,
g
=
10
m
s
−
2
For a safe turn without sliding, the velocity of a car,
v
≤
√
µ
s
R
g
∴
R
≥
v
2
µ
s
g
⇒
R
≥
100
0.8
×
10
Or
R
≥
12.5
m
Hence, option (c), for
R
=
12
m
, the car will skid (or slip) while negotiating the curve.
© examsnet.com
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