Respuesta :
Answer:
B) 12.1 m/s
Explanation:
Sum of the forces in the y direction:
∑F = ma
N − mg = 0
N = mg
Sum of the forces in the radial direction:
∑F = ma
F = m v² / r
Nμ = m v² / r
Substituting and solving for v:
mgμ = m v² / r
gμ = v² / r
v = √(gμr)
Given that μ = 0.200 and r = 75.0 m:
v = √(9.81 m/s² × 0.200 × 75.0 m)
v = 12.1 m/s
The car can turn through the circular track with a maximum speed of 12.1 m/s. Hence, option (B) is correct.
Given data:
The radius of circular track is, r = 75.0 m.
The coefficient of friction between the tire and road is, [tex]\mu = 0.200[/tex].
When the car moves around a circular track, then for safe turn through the track it is necessary to have the value of frictional force and centripetal force in a balanced amount. Therefore,
Fc = Ff
[tex]\dfrac{m \times v^{2}}{r} = \mu \times m \times g\\\\\\\dfrac{v^{2}}{r} = \mu \times g\\\\v =\sqrt{\mu \times r \times g}[/tex]
Solving as,
[tex]v =\sqrt{0.200 \times 75.0 \times 9.8}\\\\v =12.1 \;\rm m/s[/tex]
Thus, we can conclude that the car can turn through the circular track with a maximum speed of 12.1 m/s. Hence, option (B) is correct.
Learn more about the centripetal force here:
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