These the flow of electrons (the current) and where some of the electrons' energy gets converted into heat. (Lessons 5.01-5.03)
1 answer:
You might be interested in
Answer:
Constant speed: yes
Constant velocity: no
Explanation:
Let's remind the definition of speed and velocity:
- Speed is a scalar quantity, which is equal to the ratio between the distance covered (regardless of the direction) and the time taken:
- Velocity is a vector quantity, so it has both a magnitude and a direction. The magnitude is equal to the rate between the displacement of the object and the time taken, while the direction is the same as the displacement.
In this problem, we notice that:
- The speed of the car remains constant, as it is 90 km/h
- However, its direction of motion changes while the car travels round the corner: this means that the direction of the velocity is also changing, therefore velocity is not constant.
Answer:
The thermal conductivity of the biomaterial is approximately 1.571 watts per meter-Celsius.
Explanation:
Let suppose that thermal conduction is uniform and one-dimensional, the conduction heat transfer (), measured in watts, in the hollow cylinder is:
Where:
- Thermal conductivity, measured in watts per meter-Celsius.
- Length of the cylinder, measured in meters.
- Inner diameter, measured in meters.
- Outer diameter, measured in meters.
- Temperature at inner surface, measured in Celsius.
- Temperature at outer surface, measured in Celsius.
Now we clear the thermal conductivity in the equation:
If we know that ,
,
,
,
and
, the thermal conductivity of the biomaterial is:
The thermal conductivity of the biomaterial is approximately 1.571 watts per meter-Celsius.