suppose you have two toy cars. Each has a mass of 0.04 kg . the cars have tape on their bumpers that will cost them to couple to
1 answer:
The momentum of the coupled cars is 0.16 kg m/s
Explanation:
We can solve this problem by using the law of conservation of momentum: in absence of external forces, the total momentum of the two cars must be conserved before and after they couple together.
Mathematically, this can be written as
where:
is the mass of the two cars
is the initial velocity of the first car
is the initial velocity of the second car, which is at rest
ithe momentum of the coupled cars, after the collision
By re-arranging the equation and substituting the values that we have, we find the final momentum:
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Answer:
a) They are the same.
Explanation:
Assuming no friction, there should be no energy transfer and thus the Law of Conservation of Energy says:
These types of problems also disregard any air resistance the surface of the object may cause. Therefore, no energy is transferred and from the Law of Conservation of Energy, of energy is preserved.
La velocidad del objeto al tiempo
es descrito por
donde
El objeto no tiene aceleración horizontal, pues y
está determinado exactamente por su velocidad inicial en la dirección horizontal. En la dirección vertical, la gravedad es la única fuerza que actúa en el objeto, pues
. Entonces, la velocidad después de
satisface
Inmediatamente, vemos que y podemos encontrar que
.
Su posicíon es descrita al tiempo por
con
Si la posición inicial del objeto es el origen, suponemos que , y además tenemos
Queremos determinar el máximo de . Encontramos que
cuando
.