PART A)
Conductivity of insulator is very small as there is no free electrons to conduct the current trough that medium
So here number of conduction electrons are very less in insulators
PART B)
Resistance is the property of a conducting medium which will oppose the flow of current trough it
Resistance of wire directly depends on its length so resistance of long wire will be more than the resistance of short wire
Resistance inversely depends on the area so if a wire has more crossectional area then its resistance must be small
PART C)
power of light bulb is defined as rate of electrical energy
it is given by formula
P = i V
here we know that
i = 1.46 A
V = 120 volts
so power is given as
![P = 1.46 \times 120](https://tex.z-dn.net/?f=P%20%3D%201.46%20%5Ctimes%20120)
![P = 175.2 Watt](https://tex.z-dn.net/?f=P%20%3D%20175.2%20Watt)
Answer:
the heat always transfers from high temperature to low temperature body without aid of any external energy to this law the heat transfers from cup of coffee to the person body until both bodies reaches to the equilibrium state
Explanation:
Answer:10.4 times of initial velocity
Explanation:
Given
Diameter reduced by 69 %
it approaches with velocity ![v_0](https://tex.z-dn.net/?f=v_0)
suppose its velocity is v during blocked passage
suppose d is the initial diameter and
diameter is
![d_2=d(1-0.69)](https://tex.z-dn.net/?f=d_2%3Dd%281-0.69%29)
![d_2=0.31 d](https://tex.z-dn.net/?f=d_2%3D0.31%20d)
![A_2=\frac{\pi d_2^2}{4}](https://tex.z-dn.net/?f=A_2%3D%5Cfrac%7B%5Cpi%20d_2%5E2%7D%7B4%7D)
As flow is constant
![Q_1=Q_2](https://tex.z-dn.net/?f=Q_1%3DQ_2)
![d^2v_0=d_2^2v](https://tex.z-dn.net/?f=d%5E2v_0%3Dd_2%5E2v)
![v=10.40 v_0](https://tex.z-dn.net/?f=v%3D10.40%20v_0)
Answer:
He is warmed up now
Explanation:
His muscles are better and stretched now