Write a statement that explains the relationship among velocity, speed, and direction.
1 answer:
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Answer:
Masa, m = 0.088 kg
Explanation:
Given the following data;
Temperatura inicial = 30°C
Temperatura final = 120°C
Capacidad calorífica específica = 138J/kg.K
Calor absorbido, Q = 4400 cal.
Para encontrar la masa;
La capacidad calorífica viene dada por la fórmula;
Dónde;
Q representa la capacidad calorífica o la cantidad de calor.
m representa la masa de un objeto.
c representa la capacidad calorífica específica del agua.
dt representa el cambio de temperatura.
dt = T2 - T1
dt = 120 - 30
dt = 90°C to kelvin = 273 + 90 = 363K
Sustituyendo en la fórmula, tenemos;
Masa, m = 0.088 kg
Answer:
The kinetic coefficient of friction between the box and the floor is 1.020.
Explanation:
Let suppose that box is on horizontal ground. According to the Newton's Laws, an object has a net acceleration of zero when either is at rest or moves at constant velocity. Friction is a reaction to the external force that moves the box. Hence, the equation of equilibrium for the 20-Kg box is:
(Eq. 1)
Where:
- External force, measured in newtons.
- Friction force, measured in newtons.
If we know that , then the magnitude of the kinetic friction force is:
In addition, friction force is represented by the following formula:
(Eq. 2)
Where:
- Kinetic coefficient of friction, dimensionless.
- Mass, measured in kilograms.
- Gravitational acceleration, measured in meters per square second.
Now we clear the kinetic coefficient of friction:
If we know that ,
and
, then the kinetic coefficient of friction is:
The kinetic coefficient of friction between the box and the floor is 1.020.