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3 years ago

why doesn't light bend (refract) when it initially enters a glass? what actually happens to the light inside the semi-circle?

1 answer:

7 0

The light does not bend when it initially enters the glass because it travels from a less dense medium such as air to a dense medium such as glass. The refraction of light happens only on the flat side of the semi-circle, while on the circular side, it strikes on the interface.

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A top in the form of a cone is spinning about its symmetry axis at a rate �, while precessing about the vertical axis at a rate

fredd [130]

Answer:

Check the explanation

Explanation:

Kindly check the attached image below to see the step by step explanation to the question above.

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3 years ago

Mechanics is the study of

svetoff [14.1K]

Mechanics is the study of motion and force on physical objects and their surroundings

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3 years ago

A boy throws a rock with an initial velocity of 2.15 m/s at 30.0° above the horizontal. If air resistance is negligible, how lon

vladimir1956 [14]

Answer:

t = 0.11 second

The time taken to reach the maximum height of the trajectory is 0.11 second

Explanation:

Taking the vertical component of the initial velocity;

Vy = Vsin∅

Initial velocity V = 2.15 m/s

Angle ∅ = 30°

Vy = 2.15sin30 = 2.15 × 0.5

Vy = 1.075 m/s

The height of the rock at time t during the flight is;

From the equation of motion;

h(t) = Vy×t - 0.5gt^2

g= acceleration due to gravity = 9.8m/s^2

Substituting the given values;

h(t) = 1.075t - 0.5(9.8)t^2

h(t) = 1.075t - 4.9t^2

The rock is at maximum height when dh/dt = 0;

dh(t)/dt = 1.075 - 9.8t = 0

1.075 - 9.8t = 0

9.8t = 1.075

t = 1.075/9.8

t = 0.109693877551 s

t = 0.11 second

The time taken to reach the maximum height of the trajectory is 0.11 second

4 0

3 years ago

HELPP!!!! URGENT!!!!

Lorico [155]

Answer:

How Urgent are we talking?

Explanation:

5 0

3 years ago

a person hears an echo from the top of a tower , 2.2 second after the sound is produced.how far away is the tower from the perso

bekas [8.4K]

Answer:

730.4 m

Explanation:

The sound waves travels with a uniform motion (=constant velocity), therefore we can calculate the distance it travels using the formula:

$d=vt$

where

d is the distance

v is the speed of the sound wave

t is the time taken

In this problem we have:

v = 332 m/s is the speed of sound in air

t = 2.2 s is the time elapsed

Therefore, the distance between the tower and the person is

$d=(332)(2.2)=730.4 m$

5 0

3 years ago