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3 years ago

What is the purpose of a valve?

Physics

2 answers:

user100 [1]3 years ago

8 0

To prevent blood backflow!

Aleks04 [339]3 years ago

5 0

In general or valves are used to turn off or proportionately control the flow of fluid through any system. Your faucet in your bathroom is a type of valve. You can turn it all the way off and all the way on, but you can also turn it on a little bit at a time.

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A ray diagram for a refracted light ray is shown.

Rina8888 [55]

The dashed line represents the normal to the boundary

Explanation:

Refraction is a phenomenon that occurs when a ray of light crosses the interface between two mediums.

When this occurs, the ray of light changes direction and speed.

The new direction of the ray of light is given by Snell's law:

$n_1 sin \theta_1 = n_2 sin \theta_2$

where

$n_1$ is the index of refraction of the 1st medium

$n_2$ is the index of refraction of thre 2nd medium

$\theta_1$ is the angle of incidence, which is the angle between the direction of the incident ray and the normal to the boundary

$\theta_2$ is the angle of refraction, which is the angle between the direction of the refracted ray and the normal to the boundary

The index of refraction of a medium is the ratio between the speed of light in a vacuum (c) and the speed of light in that medium (v):

$n=\frac{c}{v}$

The figure in the question is missing, however you can find it in attachment.

We see that the dashed line is perpendicualr to the boundary between the two mediums, so it represents the normal.

So, the correct answer is

Normal

We note that in this case the ray of light bends towards the normal, this means that $\theta_2$ , therefore the second medium has a larger index of refraction ( $n_2>n_1$ ).

Learn more about refraction:

brainly.com/question/3183125

brainly.com/question/12370040

#LearnwithBrainly

7 0

3 years ago

A given wave has a wavelength of 1.4 m and a frequency of 2.0 Hz. How fast

stiks02 [169]

Answer:

The wave speed is 2.8 m.

Explanation:

Wavelength = 1.4 m

frequency, f = 2 Hz

the wave speed is given by

wave speed = wavelength x frequency

wave speed = 1.4 x 2 = 2.8 m

option (D) is correct.

3 0

3 years ago

To give an idea of sensitivity of the platypus's electric sense, how far from a 80nC n C point charge does the field have this m

SVETLANKA909090 [29]

The question is incomplete. The complete question is :

A platypus foraging for prey can detect an electric field as small as 0.002 N/C.

-To give an idea of sensitivity of the platypus's electric sense, how far from a +80nC point charge does the field have this magnitude?

Solution :

Given electric field, E = 0.002 N/C

Charge, Q = + 80 nC

$\therefore E = \frac{kQ}{R^2}$

or $R^2=\frac{kQ}{E}$

$R^2=\frac{9\times 10^9 \times 80 \times 10^{-9}}{0.002}$

R = 600 m

This is the distance of the charge from the point of observations.

5 0

2 years ago

As a box is pushed 30 meters across a horizontal floor by a constant horizontal force of 25 newtons, the kinetic energy of the b

irakobra [83]

Answer:

1,050 Joules

Explanation:

Step 1: work done in moving the box 30 meters

work done = force X distance

= 25N X 30 = 750 Joules

Step 2: calculate total internal energy

Total internal energy = work done + kinetic energy

= 750 Joules + 300 Joules

= 1,050 Joules = 1.05 KJ

5 0

3 years ago

Need help with 2 and 3 pls help, due in 1 1/2 hours (GIVING 20 POINTS)

Anarel [89]

2) acceleration = final velocity - initial velocity / time —> V-U/T
Acceleration is the change in velocity over the change in time so it can be represented by the equation a = Δv/Δt.
3) first one- F=10.5 N
second one- 4 m/s^2
third one- 1200N

7 0

3 years ago