What are two reasons why a home computer scanner requires
2 answers:
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Answer:
Período del tambor: , fuerza sobre la prenda:
, velocidad lineal del tambor:
, velocidad angular del tambor:
.
Explanation:
La expresión tiene un error por omisión, su forma correcta queda descrita a continuación:
<em>"Una prenda de 320 gramos de ropa gira en el interior de una lavadora si dicha lavadora tiene un radio de 40 centímetros y gira con una frecuencia de 4 hertz. Halle </em><em>a)</em><em> el período, </em><em>b) </em><em>la velocidad angular, </em><em>c) </em><em>la fuerza con la que gira la prenda y </em><em>d) </em><em>la velocidad lineal de la lavadora."</em>
El tambor gira a velocidad angular constante (), en radianes por segundo, lo cual significa que la prenda experimenta una aceleración centrífuga (
), en metros por segundo al cuadrado. En primer lugar, calculamos el período de rotación del tambor (
), en segundos:
(1)
Donde es la frecuencia, en hertz.
()
Ahora determinamos la fuerza aplicada sobre la prenda (), en newtons:
(2)
(2b)
Donde:
- Masa de la prenda, en kilogramos.
- Radio interior del tambor, en metros.
(,
,
)
La velocidad lineal de la lavadora es:
(3)
(,
)
Y la velocidad angular del tambor de la lavadora:
()
We can solve the problem by using the first law of thermodynamics, which states that:
where
is the change in internal energy of the system
Q is the heat absorbed by the system
W is the work done by the system
In our problem, the heat absorbed by the system is Q=+194 kJ, while the work done is W=-120 kJ, where the negative sign means the work is done by the surroundings on the system. Therefore, the variation of internal energy is
where
Q is the heat absorbed by the system
W is the work done by the system
In our problem, the heat absorbed by the system is Q=+194 kJ, while the work done is W=-120 kJ, where the negative sign means the work is done by the surroundings on the system. Therefore, the variation of internal energy is
Answer:
(a)
(b)
(c)
Explanation:
(a) According to Newton's second law, the acceleration of a body is directly proportional to the force exerted on it and inversely proportional to it's mass.
(b) According to Newton's third law, the force that the sled exerts on the girl is equal in magnitude but opposite in the direction of the force that the girl exerts on the sled:
(c) Using the kinematics equation:
For the girl, we have and
. So:
For the sled, we have . So:
When they meet, the final positions are the same. So, equaling (1) and (2) and solving for t:
Now, we solve (1) for