En la siguiente expresión matemáticas w=mg el peso w con relación a se relaciona con la masa m en una proporción
1 answer:
Answer:
a) Directamente proporcional
Explanation:
El peso se puede definir como la fuerza que actúa sobre un cuerpo o un objeto como resultado de la gravedad.
Matemáticamente, el peso de un objeto viene dado por la fórmula;
Donde;
m es la masa del objeto.
g es la aceleración debida a la gravedad.
De la expresión matemática, podemos deducir que el valor del peso de un objeto es directamente proporcional a la masa del objeto.
Por lo tanto, un aumento en la masa de un objeto provocaría un aumento en el peso del objeto y viceversa.
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1) The work done by tension is 12.0 J
2) The final speed of the box is 1.57 m/s
Explanation:
The work done by a force on an object is given by:
where
F is the magnitude of the force
d is the displacement
is the angle between the direction of the force and of the displacement
For the box in this problem, we have:
F = 6.2 N is the force applied (the tension in the string)
d = 193.0 cm = 1.93 m is the displacement
assuming that the string is horizontal
Substituting, we find the work done by the tension:
2)
In order to determine the final speed of the box, we need to determine its acceleration first.
Beside the tension, acting forward, the other force acting horizontally on the box is the force of friction, whose magnitude is
where
is the coefficient of friction
m = 2.8 kg is the mass of the box
is the acceleration of gravity
Substituting,
Therefore, the net force on the box is
And the acceleration can be found by using Newton's second law:
where
F = 1.8 N is the net force
m = 2.8 kg is the mass of the box
a is the acceleration
Solving for a,
Now we can finally find the final speed using the suvat equation:
where
v is the final speed
u = 0 is the initial speed
is the acceleration
s = 1.93 m is the displacement
Solving for v,
Learn more about work:
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