美国大学物理题 救命啊Problem 5.A car is about to make a turn at v=3m/s such that the radius of the kissing circle at the turn is 10m.What should the minimum coefficient of friction be so that the car does not slip on the road?A) 0.09B) 0.04

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美国大学物理题 救命啊Problem 5.A car is about to make a turn at v=3m/s such that the radius of the kissing circle at the turn is 10m.What should the minimum coefficient of friction be so that the car does not slip on the road?A) 0.09B) 0.04

美国大学物理题 救命啊Problem 5.A car is about to make a turn at v=3m/s such that the radius of the kissing circle at the turn is 10m.What should the minimum coefficient of friction be so that the car does not slip on the road?A) 0.09B) 0.04
美国大学物理题 救命啊
Problem 5.A car is about to make a turn at v=3m/s such that the radius of the kissing circle at the turn is 10m.What should the minimum coefficient of friction be so that the car does not slip on the road?
A) 0.09
B) 0.04
C) 0.15
D) 0.5
E) One must know the mass of the car to answer the question.

美国大学物理题 救命啊Problem 5.A car is about to make a turn at v=3m/s such that the radius of the kissing circle at the turn is 10m.What should the minimum coefficient of friction be so that the car does not slip on the road?A) 0.09B) 0.04
题目大意：
问题5：汽车以V =3米/秒在路上转了一个圆,圆的半径为10m.
若要汽车在路上不打滑,则应该采取的摩擦系数最低是多少?
一）0.09
B）0.04
C）0.15
D）0.5
e）必须知道车的质量才能回答这个问题.
这个题考察的知识点很简单,就是匀速圆周运动的向心力公式而已
记汽车的质量为m,摩擦系数为μ,重力加速等为g,转弯半径为r
向心力F=m*v^2/r
向心力由汽车摩擦力提供,摩擦力f=μmg
两式联立,消去m得μ=v^2/(rg)
代入数据得μ=0.09
选A

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