Answer:
The energy that drives this movement is heat within the earth, this heat comes from two main sources which are;
1) residual heat left over from the formation of our planet billions of years ago.
2) The radioactive decay of naturally occurring chemical elements (notably uranium, thorium, and potassium ) in the earth releases energy in the form of heat. These two sources of heat warm Earth’s mantle and cause it to rise and sink, this rising and sinking creates a convectional movement of earth mantle.
Answer:
Explanation:
b = b₀ cos ω t
When t = 0 , magnetic field will be b₀ and positive or directed into the page . This is the maximum value of magnetic field. As times goes ahead , magnetic field decreases so magnetic flux decreases . The induced emf or current will be such that it will opposes this reduction of magnetic field. Hence , current in clockwise direction will be generated in the coil which will generate magnetic flux into the paper.
In this way current will be induced clockwise.
Answer:
Speed of motorcycle is 40 mph and speed of car is 50 mph
Explanation:
Let the peed f the motorcycle is v m /sec
According to question speed of motorcycle = 2v-30 mph
Now it is given that in two hours car is 20 miles ahead from motorcycle
Distance traveled by motorcycle in 2 hour = 2v
And distance traveled by car in two hour = 2×(2v-30)
Now according to question
4v-60 = 2v+20
2v = 80
v = 40 mph
So speed of motorcycle is 40 mph
And speed of car = 2v-30 = 2×40-30 = 50 mph
Answer:
maximum current is 1.68 A
Explanation:
Maximum current is given as:
ε = 12 V
R=7.1105Ω
