In this particular case, where car is movig through curvature, so it is moving in circular motion, force acting on car is centripetal force which holds car not to fly out. Centripetal force is always ponted in the middle of circle. Here frictional force has role of centripetal force. If frictional force is to weak, car would fly out of curvutare.
Well a basic explanation is that some elements have enough electrons to be considered stable. These elements do not need to react with other elements to gain more electrons. Reactive elements are no where near stable; they respond with other elements in order to become stable. The more unstable, the harsher the reaction is.
Answer:
v = 7.9 m/s
Explanation:
length of the vine (L) = 20 m
initial angle with the vertical = 45 degrees
final angle with the vertical = 30 degrees
acceleration due to gravity (g) = 9.8 m/s^{2}
speed (v) =?
to solve this problem we can apply the equation below:
loss in potential energy = gain in kinetic energy
m x g x h = 1/2 x m x ![v^{2}](https://tex.z-dn.net/?f=v%5E%7B2%7D)
v = ![\sqrt{2gh}](https://tex.z-dn.net/?f=%5Csqrt%7B2gh%7D)
before we can apply the above we need to get our height
height = initial vertical height - final vertical height
height = (L - L cosθ2) - (L - L cosθ1)
height = (20 - 20cos45) - (20 - 20cos30) = 3.2 m
v = ![\sqrt{2 x 9.8 x 3.2}](https://tex.z-dn.net/?f=%5Csqrt%7B2%20x%209.8%20x%203.2%7D)
v = 7.9 m/s
B. should be your answer!