Help with kinetics and conservation problem thanks

In summary: Yes, but if you have 6 unknowns and 3 equations can you solve it?Secondly, when the kinetic energy is conserved, how many equations do you now have?Thirdly, if 2 are stuck together, how many now?
  • #1
CarlosPacheco
3
0
An object of mass m1 moving with velocity v1 in three dimensions collides with
a second object of mass m2 moving with velocity v2. We are interested in solving
for the velocities of the objects after the collision. There are six unknown values
f (v1x)f ; (v1y)f ; (v1z)f ; (v2z)f ; (v2y)f ; (v2z)f g in three dimensional.

(1) If no additional information is given, how many conservation equations
do we have? Do we have enough information to solve for the six unknown values?
If not, how many additional equations or additional pieces of information do we
need to solve for the six unknown values?

(2) If we know that the kinetic energy of the two objects is conserved (a.k.a.
“totally elastic”collision), how many conservation equations do we have? Do we
have enough information to solve for the six unknown values? If not, how many
additional equations or additional pieces of information do we need to solve for
the six unknown values?

(3) If we know that the two objects are stuck together (,a.k.a. “totally in-
elastic”collision) how many conservation (or other conservation-like) equations
do we have? Do we have enough information to solve for the six unknown val-
ues? If not, how many additional equations or additional pieces of information
do we need to solve for the six unknown values?

Note: do not answer this question with answers like “six, yes, none”. While
you do not need to write down the conservation equations, you do need to at
least mention what the equations are.
 
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  • #2
What do you think the answers are and what are equations?
 
  • #3
the question are the 1-2-3 listed there... I don't understand the question. also, my professor likes to write a lot as you can see
=S
 
  • #4
CarlosPacheco said:
the question are the 1-2-3 listed there... I don't understand the question. also, my professor likes to write a lot as you can see
=S

Conservation of momentum: The momentum in a given direction in a closed system is constant.

Meaning that: momentum before = momentum after in a particular direction.

So for questions 1, momentum will be conserved in how many directions given you know the above definition? (You are in 3D)
 
  • #5
rock.freak667 said:
Conservation of momentum: The momentum in a given direction in a closed system is constant.

Meaning that: momentum before = momentum after in a particular direction.

So for questions 1, momentum will be conserved in how many directions given you know the above definition? (You are in 3D)

would be then conserved in all directions right?? X, Y and Z
 
  • #6
CarlosPacheco said:
would be then conserved in all directions right?? X, Y and Z

Yes, but if you have 6 unknowns and 3 equations can you solve it?

Secondly, when the kinetic energy is conserved, how many equations do you now have?

Thirdly, if 2 are stuck together, how many now?
 

FAQ: Help with kinetics and conservation problem thanks

What is the definition of kinetics and conservation?

Kinetics refers to the study of the rates of chemical reactions and the factors that influence them. Conservation, in this context, refers to the principle of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction.

How do I solve a kinetics and conservation problem?

To solve a kinetics and conservation problem, you will need to know the initial and final concentrations of the reactants and products, the rate of the reaction, and any other relevant information. You can then use mathematical equations and principles to determine the rate constant, reaction order, and other important values.

What is the difference between zero, first, and second order reactions?

In a zero-order reaction, the rate of the reaction is independent of the concentration of the reactants. In a first-order reaction, the rate is directly proportional to the concentration of one reactant. In a second-order reaction, the rate is directly proportional to the product of the concentrations of two reactants.

How do I calculate the rate constant for a reaction?

The rate constant can be calculated by dividing the rate of the reaction by the concentrations of the reactants raised to the appropriate powers. The units of the rate constant will depend on the order of the reaction.

What are some real-world applications of kinetics and conservation?

Kinetics and conservation are important in many industries, such as pharmaceuticals, food and beverage production, and environmental science. They are used to understand and control chemical reactions in these fields, leading to more efficient and sustainable processes.

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