Multiply the power (1,800 watts) by time (1,200 seconds) to get 2,160,000 joules (or 2.16 MJ)
The transfer of thermal energy as heat requires a difference in temperature between the two points of transfer. Heat may be transferred by means of conduction, convection, or radiation. Conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object.
Answer:
The magnetic field B of the transmission line is 4.5·10^(-6)T. The ratio B/Be is 0.0009% (there is no risk to human health)
Explanation:
we will consider a dc transmission line as an infinite longitudinal line in the Z-axis with a dc current of 180 A. To solve the problem we will use ampere's law. We can consider the geometry of the problem (Rotational symmetry in respect of Z-axis) than the field B is annular with center in the transmission line.
We will use a circular amperian curve C. Therefore:
For a height of 8.0m (r=8m):
Compared to the earth magnetic field:
Answer:
cosine is adjacent over hypotenuse
Explanation:
How I know? It's just a basic formula for triangles, and my teacher taught me this. Sorry if this didn't help.
The answer is Decreasing.
This is because the molecules in the liquid slowly escapes
when it undergoes the evaporation process. Molecules are no longer compact as
it was during the liquid state. The average energy of the molecules is lower,
causing it to decrease in temperature.