PHYSICS
COLLEGE

Answer:

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

HIGH SCHOOL

The strength of gravitational force is dependent on the masses of and distance between two objects. a. True

b. False

Truer words are seldom written.

COLLEGE

If the tensile strength of the Kevlar 49 fibers is 0.550 x 106 psi and that of epoxy resin is 11.0 x103 psi, calculate the strength of the composite material that contains 79 percent by volume of Kevlar 49 fibers. The answer should be in psi with 0 decimals of accuracy.

Answer:

Explanation:

Notation

represent the tensile strength for the Kevlar 49 fibers

represent the tensile strength for the epoxy resin

79% by volume is made of Kevlar 49 fibers

The rest 100-79=21% is made of epoxy resin

Tensile strength is a "measurement of the force required to pull something such as rope, wire, or a structural beam to the point where it breaks". Can be defined as "the maximum amount of tensile stress that it can take before failure".

For this case we need to use a basis of calculus since we don't know the total volume but we can assume a reference value on order to make the calculations.

If we assume a total volume of we can do the follwoing balance:

We can replace the values given:

So then the strength of the composite material is :

HIGH SCHOOL

Which of the following are electromagnetic waves? sound waves water waves ground waves light waves`

Hello! Light waves are an example of electromagnetic waves. I hope this helps!

MIDDLE SCHOOL

A pelican dives downward from a height of 35 m with an acceleration of 9.8 m/s² to grab a sardine at the surface of the ocean. How long does the dive take? OA) 0.75 s

OB) 1.9 s

OC) 2.7 s

OD 7.1 s

Answer:

The dive takes 2.673 seconds.

so OC i think

D = ViT + 1/2 at^2 If the pelican is traveling at 0 m/s vertically at t=0 then that means Vi=0Additionally, if you consider the fact that the distance traveled and acceleration is both the same direction, then sign doesn't matter: 35 = (0) x t + 1/2 (9.8) t^2

35 = 4.9t^2

7.14286 = t^2

t = 2.673s

and you round up to the whole number which would leave your answer to be > OC: 2.7s