Answer:
Heat generated in the rod is 8.33 watts.
Explanation:
It is given that,
Length of rod, l = 2 m
Area of cross section, 
Resistivity of rod, 
Potential difference, V = 0.5 V
The value of resistance is given by :
R = 0.03 ohms
Let H is the rate at which heat is generated in the rod . It is given by :
Since, 
So, the at which heat is generated in the rod is 8.33 watts. Hence, this is the required solution.
Explanation:
Average speed =total distance ÷ total time
speed = d ÷ t
d= 74400
t= 16
then,
speed = 74400÷16
=4650
Mechanical or Electromagnetic
Answer:
the cost of operating the light bulb is 72 cents.
Explanation:
Given;
cost of electricity, C = 6 cents / kW.h
power of light bulb, P = 100 W
time of light power consumption, t = 4 hours per day for 30 days
total time = 4 hours x 30 = 120 hours
Power consumed by the light bulb is calculated as;
P = 100 x 120 = 12000 w.h = 12 kW.h
Cost of power consumption = 6 cents/kWh x 12 kWh
= 72 cents
Therefore, the cost of operating the light bulb is 72 cents.
