Answer
The Value of r = 0.127
Explanation:
The mathematical representation of the two resistors connected in series is

And from Ohm law


The mathematical representation of the two resistors connected in parallel is


From the question 
=> 
Dividing equation 2 with equation 1
=> 

We are told that 
From equation 3



Using the quadratic formula

a = 1 b = -8 c =1



Now r = 0.127 because it is the least value among the obtained values
Answer:
By electromagnetic waves.
Explanation:
The sun transfers heat to earth via electromagnetic waves in twomajor ways:
this is the transfer of energy by invisible electromagnetic ways.
The radiant sun energy warms the atmosphere and becomes heat energy. This transfer of heat through movement of fluids or usually air is called convection.
<em>ANSWER</em>
<u>An increase in relative humidity</u>
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Answer:
a) battery-->electrical current-->copper wire rotor -->magnet--> mechanical energy
Explanation:
Answer:

Explanation:
Given that initially ball moves in the horizontal direction ,it means that the velocity in the vertical direction is zero.
Horizontal distance = 13 m
Vertical distance = 57 cm
Lets take time to cover 57 cm distance in vertical direction is t.
We know that g is the constant acceleration in the vertical direction so we can apply the equation of motion in the vertical direction.

Here 
S= 57 cm

t=0.34 s
Now in the horizontal direction

Here x=13 m
t= 0.34 s
So


So the initial speed of ball is 38.13 m/s.