Answer:
Explanation:
b ) The problem is based on Doppler's effect of sound
f = f₀ x (V - v₀) /( )
f is apparent frequency ,f₀ is real frequency , V is velocity of sound , v₀ is velocity of observer going away , is velocity of source going away
778 = 840 x (340 - 14)/ (340 + )
340 + = 341.18
= 1.18 m /s
it will go away from the observer or the cyclist.
speed of train = 1.18 m /s
a )
For a stationary observer v₀ = 0
f = f₀ x V /( )
= 840 x 340 / (340 + 1.180)
= 837 Hz
Answer:
Series combination:
Equivalent resistance =10Ω
Parallel combination:
Equivalent resistance
Explanation:
Resistance: Resistance is the ratio of voltage to the current.
R = resistance
I = current
V= potential difference(voltage)
There are two types of resistance combinations.
Series combination: If the ending point of one resistance is connected to the starting point of other resistance that combination is known as series combination.
If R₁,R₂ and R₃ are connected in series combination.
Then equivalent resistance = R₁+R₂+R₃
Parallel combination: If the ending point and the starting point of the all resistance are the same points that combination is known as parallel combination.
If R₁,R₂ and R₃ are connected in parallel combination.
Then equivalent resistance
Here R₁=7Ω and R₂=3Ω
If R₁ and R₂ connected in series combination
Then equivalent resistance = (7+3) Ω
=10Ω
If R₁ and R₂ connected in parallel combination
Then equivalent resistance