You know that a collision must be "elastic" if:
The momentum of the two-object system doesn't change
The sum of the final kinetic energies equals the sum of the initial kinetic energies
There is no change in the internal energies of the objects (thermal energy, vibrational energy, etc.)
The colliding objects stick together The colliding objects are stretchy or squishy
which are true?
b.
c.
a and d are nor revealing to determine elasticity.
thanks,
can you help me with this one
What is the angular momentum A if A = <7, 5, 0> m and = <-20, 10, 0> kg·m/s?
I thought you just do 7(20)+(5)10
If it is in three orthagonal dimensions, you have to
sqrt((140^2)+50^2 + 0^2)
To determine which statements are true, we need to understand the concept of an "elastic collision." An elastic collision is a type of collision in which both the momentum and kinetic energy are conserved.
Let's evaluate each statement to see which are true:
1. The momentum of the two-object system doesn't change: This statement is true for an elastic collision. In an elastic collision, the total momentum of the system before the collision is equal to the total momentum after the collision.
2. The sum of the final kinetic energies equals the sum of the initial kinetic energies: This statement is also true for an elastic collision. In an elastic collision, the total kinetic energy before the collision is equal to the total kinetic energy after the collision.
3. There is no change in the internal energies of the objects (thermal energy, vibrational energy, etc.): This statement is not necessarily true for an elastic collision. While the total internal energy of the system may remain the same, individual objects involved in the collision can undergo changes in their internal energies.
4. The colliding objects stick together: This statement is false for an elastic collision. In an elastic collision, the objects involved do not stick together. They rebound off each other with the same relative velocity but in opposite directions.
5. The colliding objects are stretchy or squishy: This statement is not a characteristic of an elastic collision. Elastic collisions can occur between objects of any nature, whether they are stretchy, squishy, or rigid.
In summary, the true statements regarding an elastic collision are:
- The momentum of the two-object system doesn't change.
- The sum of the final kinetic energies equals the sum of the initial kinetic energies.