Answer:
I think theres air that flows thru it
Explanation:
Answer:
your right answer is true
hope it helps you
Answer:
Explanation:
Initially , crate is going upwards with uniform velocity so net force on crate is zero.
Tension T = mg ( its weight )
= 14.5 x 9.8
= 142.1 N
Now tension is increased to 180 N , so net force on it
= 180 - 142.1 = 37.9 N
Work done by tension that is 180 N
= Tension x displacement
= 180 x 1.15 x 10⁻³
= .207 J
Answer:
Explanation:
Formula for intensity of light after transmission for unpolarised light is
I₀ / 2 , We shall take up 180 degree disk first .
For second transmission , the formula is
I = I₀ Cos²θ , θ is angle between axis of polarizer and axis of vibration.
If we take up 30 degree polariser
I = I₀ / 2 Cos²( 180 - 30 )
= .375 I₀
For third transmission
I_ final = .375 I₀ x cos( 90 - 30 )
= .1875 I₀
Final/I₀ = .1875
Answer:
The speed of the plank is 81.68 m/s
Explanation:
Given that,
Speed of bullet = 152 m/s
Speed of wood = 128 m/s
Speed of another bullet = 97 m/s
We need to calculate the speed of plank
Using conservation of momentum
Where,
u = initial velocity
v = final velocity
....(I)
....(II)
From equation(I) and equation(II)
Hence, The speed of the plank is 81.68 m/s