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sergejj [24]
3 years ago
14

Which of these diagrams most accurately illustrates what happens when a ray of light from underwater strikes the smooth surface

of the water at an angle of incidence greater than the critical angle?

Physics
2 answers:
Flura [38]3 years ago
5 0

Explanation :

When the ray of light from underwater strikes the smooth surface of the water at an angle of incidence greater than the critical angle, then total internal reflection occurs (TIR). The ray of light must pass from the denser medium to rarer medium.

When the angle of incidence is equal to 90, the angle formed is called critical angle.

In this case, the diagram (D) shows the angle of incidence greater than the critical angle and hence TIR occurs.

laiz [17]3 years ago
4 0
Diagram D!!!!!!!!!!!!!!!
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A train moves at 300 km/h. How far will it go in 5 hours?
faust18 [17]

Answer:

1,500 km

Explanation:

300 km/h

300 kilometers PER <u><em>HOUR</em></u>

<u><em></em></u>

So you want to see how far it will go in 5 hours, all you need to do is multiply the kilometers by 5. Since we know that per hour it's 300 km.

300 * 5 = 1,500

The train moves at 1,500 km in 5 hours.

Hope this helped!

Have a supercalifragilisticexpialidocious day!

5 0
3 years ago
Please help!!
xz_007 [3.2K]

Displacement is the area under the velocity/time graph. So for example this object's displacement in the first 3 seconds is (1/2)(3sec)(12.5 m/s)= 18.75m. (and then it starts backing up, displacement decreasing, after 3sec when velocity is negative).

But This object is never speeding up. Its velocity is smoothly decreasing at (25/6) m/s^2 (the slope of the graph). So the answer to the question is actually zero.

3 0
3 years ago
Would the value of "g" be affected if the size of the Bob is varied ?​
marshall27 [118]

Answer:

Any variable would be affected if the product is varied.

Explanation:

If you have any questions feel free to ask in the comments - Mark

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6 0
3 years ago
Simple machines ________ the amount of work needed to lift an object.
weqwewe [10]
B: Reduce!!......................
6 0
3 years ago
If 2000 kg cannon fires 2 kg projectile having muzzle velocity 200 m/s then the KINETIC ENERGY of the projectile will be ("E4" m
nordsb [41]

Answer:

K=4\times 10^4\ J

Explanation:

Given that,

Mass of cannon is,M =  2000 kg

Mass of projectile, m = 2 kg

Velocity of the projectile, v = 200 m/s

We need to find the kinetic energy of the projectile. We know that the formula for the kinetic energy of an object is given by :

K=\dfrac{1}{2}mv^2\\\\\text{Putting all the values, we get}\\\\K=\dfrac{1}{2}\times 2\times (200)^2\\\\K=40000\ J

or

K=4\times 10^4\ J

So, the kinetic energy of the projectile will be 4\times 10^4\ J.

7 0
3 years ago
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