1. Explain, from a force standpoint, why you need to reduce your normal driving
ID: 1273368 • Letter: 1
Question
1. Explain, from a force standpoint, why you need to reduce your normal driving speed around curves when it rains.
2. A disk and a sphere are released simultaneously at the top of an inclined plane. They roll down without slipping. Which will reach the bottom first?
3. A satellite of mass M takes time T to orbit a planet. Discuss the dependence T vs M.
4. Take a spring and cut it in half. What can you say about the spring constant of the smaller springs relative to the original one? Explain.
5. Suppose you
Explanation / Answer
a)Because friction force is reduced due to wet tyres..
And this friction provides centrepetal force to the vehicle..
So
f=mv^2/r
So v is reduced
2)Both will reach at same time
3)T^2 =(4pi^2/GM)*R^3
4)KL =Constant
K is stiffness and L is length
So if L'=L/2
K'=2K (ans)
5)Because torque exerted on branch will increase and will tend to break it at the trunk..
6)No, because static friction balances the normal froce applied by the wall (ans)