The coefficient of performance of a residential heat pump is 1.6. Calculate the heating effect in kJ/s this heat pump will produ
1 answer:
You might be interested in
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.