Answer:
Switches in mains circuits should always be included in the live wire so that when the switch is open no electrical energy can reach an appliance. If the switch is included in the neutral wire, electrical energy can still enter an appliance, and could possibly cause an electric shock (Figure 7.10).
Explanation:
Answer:
<em>Answer: D. Only R</em>
Explanation:
<u>The Principle Of Conservation Of Mechanical Energy</u>
In the absence of friction, the total mechanical energy is conserved. That means that
Em=U+K is constant, being U the potential energy and K the kinetic energy.
At the top of the path (point Q), Joshua is at rest but his height is at a maximum. Thus his kinetic energy is zero.
At point P, Joshua is at the minimum level (potential energy zero) and his speed is at a maximum.
At point R, Joshua has some height and some speed which means he has both types of energy.
Answer: D. Only R
Answer:
t = 1030 s
Explanation:
Let's start by calculating the resistance of the coil,
V = I (R + ri)
R = V / I - ri
R = 10/10 -0.03
R = 0.97 Ω
Now we can calculate the power supplied to the water
P = I2 R
P = 10 2 0.97
P = 97 w
Work energy is power for time
E = W = P t
t = W / P
t = 100 103/97
t = 1030 s
