the track. What is the radius of the track? 2. (20 points) The figure below show
ID: 1796084 • Letter: T
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the track. What is the radius of the track? 2. (20 points) The figure below shows a potential energy graph for a particle. 2 U(x) AB C D E a G points stable uirium Identify the point or points of.. b) (3 points) unstable equilibrium eF If the particle starts at point A, moving to the right, with a total energy of E2, identify the point or points of c) (3 points) fastest speed F d) (3 points) lowest kinetic energy E e) (3 points) turning point C omd ) (5 points) If the particle has a total energy of Ei and is at point C, can it get to point E? Explain your answer. 3. (25 points) A 0.45-kg ball, traveling at 3.8 m/s in the positive x-direction, has a head-on, elastic collision with 0.9-kg ball that was initially traveling at 0.8 m/s in the positive x-direction. What are their speeds and directions after the collision?Explanation / Answer
(2)
a) Stable equilibrium - at point B and D
b) Unstable equilibrium - at point C and E
c) Fastest speed at point E.
d) & e) Turning points are points where the particle has no more kinetic energy and has to stop or turn back.
To find turning points, draw a horizontal line on the energy graph at the value of the total energy (ln our case it is at
E2). places where the line intersect U are called turning points.
At turning points - Total energy = Potential energy (kinetic energy is 0)
d) lowest kinetic energy = at point F
e) Turning point is point F.
f) lf particle has total energy of E1 and is at point C-
Turning points will be where line intersect U and C will be the point where speed is fast. so, lt can get to point E.
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