Answer:
2000 kg/m³
Explanation:
Density = (mass[kg])/(volume[m³])
Density of the brick = (.128kg)/(.02•.04•.08) = 2000 kg/m³
Mass of yellow train, my = 100 kg
Initial Velocity of yellow train, = 8 m/s
mass of orange train = 200 kg
Initial Velocity of orange train = -1 m/s (since it moves opposite direction to the yellow train, we will put negative to show the opposite direction)
To calculate the initial momentum of both trains, we will use the principle of conservation of momentum which
The sum of initial momentum = the sum of final momentum
Since the question only wants the sum of initial momentum,
(100)(8) + (200)(-1) = 600 m/s
Questions Diagram is attached below
Answer:
Explanation:
From the question we are told that:
Speed of Train 
Angle 
Height of window 
Width of window 
The Horizontal distance between B and A from Trigonometric Laws is mathematically given by
Therefore
Distance from A-A
Therefore
Time Required to travel trough d is mathematically given as
Answer:
Explanation:
a ) The angle between the polarization axis of two adjecent sheet
= 90 / 3 = 30 degree.
The formula for intensity of polarised light from unpolarised light ( first transmission
I₁ = I₀ /2
I₀ is intensity of unpolarised light and I₁ is intensity of light after first time polarization .
The relation of I₁ and I₂ is as follows
I₂ = I₁ cos²30
= I₀/2 x3/4
=3 I₀/8
Relation between I₃ and I₂ is as follows
I₃ = I₂ cos²30
= 3I₀ / 8 x 3/4
= 9 I₀ / 32
= 0 .28 I₀
In case of stack of 4 plates
angle between two plates = 90/4 = 22.5 degree
I₁ = I₀ /2
I₂ = I₁ cos²22.5
= I₀ /2 x .85
I₃ = I₂ cos²22.5
= I₀ /2 x .85 x .85
= .36 I₀
