Energy transmitted by will feel warm

Most stars consist of what

Alenkinab [10]

Answer: The Answer is D 25% is made of helium.

Explanation:

3 0

3 years ago

What are the rows of the periodic table of the elements also called?

Ostrovityanka [42]

Answer:

periods

Explanation:

7 0

3 years ago

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When gasoline is burned in the cylinder of an engine, it creates a high pressure that pushes the piston. If the pressure is 100.

Marianna [84]

Answer:

$\dot W=2.1074\ hp$

Explanation:

Given:

pressure on the piston, $P=100\ psi=689476\ Pa$

diameter of the piston, $d=3\ in=0.0762\ m$

displacement of the piston, $s=0.05\ m$

time taken in the piston displacement, $t=0.1\ s$

Now, we find the force on the piston:

$F=P.A$

where, A = area upon which pressure acts

$A=\pi.\frac{d^2}{4}$

$A=\pi.\frac{0.0762^2}{4}$

$A=0.00456\ m^2$

$\therefore F=689476\times 0.00456$

$F=3144.2638\ N$

we know that Power is given as:

$\dot W=\frac{F.s}{t}$

$\dot W=\frac{3144.2638\times 0.05}{0.1}$

$\dot W=1572.1319\ W$

$\dot W=2.1074\ hp$

6 0

3 years ago

Answer the question please

kirill [66]

Answer:

i think is third

Explanation:

7 0

4 years ago

A ray of light traveling in air is incident on the surface of a block of clear ice (of index 1.309) at an angle of 25.5 ◦ with t

sergij07 [2.7K]

Answer: $135.29\º$

The figure attached will be helpful to understand the solution.

Here we see two cases, reflection and refraction of light.

According to the laws of reflection:

1. The incident ray, the reflected ray and the normal are in the same plane.

2. The angle of incidence is equal to the angle of reflection.

*Note the normal is perpendicular to the plane, with a $90\º$ angle with the surface

And this can be visualized in the figure, where the angle ${\theta}_{1}$ with which the incident ray hits the surface is equal to the angle with which this same ray is reflected.

On the other hand we have Refraction, a phenomenon in which the light bends or changes its direction when passing through a medium with a refractive index different from the other medium.

In this context, the Refractive index is a number that describes how fast light propagates through a medium or material.

According to Snell’s Law:

$n_{1}sin(\theta_{1})=n_{2}sin(\theta_{2})$ (1)

Where:

$n_{1}=1$ is the first medium refractive index (the air)

$n_{2}=1.309$ is the second medium refractive index (the ice)

$\theta_{1}=25.5\º$ is the angle of the incident ray

$\theta_{2}$ is the angle of the refracted ray

Now, firstly we have to find $\theta_{2}$ and then, by geometry, find $\alpha$ and $\beta$ which sum the angle between the reflected and the refracted light.