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sukhopar [10]
3 years ago
14

according to the law of reflection what is the relationship between the angle 9f incidence and the angle of reflection

Physics
2 answers:
ryzh [129]3 years ago
7 0

According to the law of reflection, the angle of incidence and the angle of reflection are equal angles.

Alja [10]3 years ago
4 0

Answer:

Angle of incidence is equal to the angle of reflection.

Explanation:

Reflection is defined as the repropagation of light rays incident on a surface. An incident light is a light striking the surface of a plane mirror at an angle to the mirror. This incident light will reflect out at the same angle it strikes the plane. This angle is known as the angle of glance (g). The ray perpendicular to the plane surface is called the normal ray.

Therefore, the angle between the incident ray and the normal ray will be the angle of incidence (i) and the angle between the reflected ray and the normal ray will be the angle of reflection (r). Since the angle the incident ray made with the plane surface is equal to the angle that the reflected ray made with the plane surface then our angle of incidence will also be equal to the angle of reflection according to the second law of reflection i.e i=r.

i = r = 90°-g

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A flat uniform circular disk (r= 2.00m,
dusya [7]

Incomplete question.The Complete question is here

A flat uniform circular disk (radius = 2.00 m, mass = 1.00 ✕ 102 kg) is initially stationary. The disk is free to rotate in the horizontal plane about a friction less axis perpendicular to the center of the disk. A 40.0-kg person, standing 1.25 m from the axis, begins to run on the disk in a circular path and has a tangential speed of 2.00 m/s relative to the ground.

a.) Find the resulting angular speed of the disk (in rad/s) and describe the direction of the rotation.

b.) Determine the time it takes for a spot marking the starting point to pass again beneath the runner's feet.

Answer:

(a)ω = 1 rad/s

(b)t = 2.41 s

Explanation:

(a) initial angular momentum = final angular momentum  

0 = L for disk + L............... for runner

0 = Iω² - mv²r ...................they're opposite in direction

0 = (MR²/2)(ω²) - mv²r ................where is ω is angular speed which is required in part (a) of question

0 = [(1.00×10²kg)(2.00 m)² / 2](ω²) - (40.0 kg)(2.00 m/s)²(1.25 m)

0=200ω²-200

200=200ω²

ω = 1 rad/s

b.)

lets assume the "starting point" is a point marked on the disk.

The person's angular speed is  

v/r = (2.00 m/s) / (1.25 m) = 1.6 rad/s

As the person and the disk are moving in opposite directions, the person will run part of a revolution and the turning disk would complete the whole revolution.

(angle) + (angle disk turns) = 2π

(1.6 rad/s)(t) + ωt = 2π

t[1.6 rad/s + 1 rad/s] = 2π

t = 2.41 s

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3 years ago
Robert is riding the Giant Drop at Great America. If
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Explanation:

i hope this helps, its not the same person but its the same equation.

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The parking brake on a 1000 kg Cadillac has failed, and it is rolling slowly, at 1 mph , toward a group of small children. Seein
iogann1982 [59]

Answer:

0.5 mph in the opposite direction

Explanation:

m_1 = Mass of Cadillac = 1000 kg

v_1 = Velocity of Cadillac = 1 mph

m_2 = Mass of Volkswagen = 2000 kg

v_2 = Velocity of Volkswagen

In order to know the speed the system must have the momentum exchange

As the linear momentum of the system is conserved

m_1v_1+m_2v_2=0\\\Rightarrow v_2=-\dfrac{m_1v_1}{m_2}\\\Rightarrow v_2=\dfrac{1000\times 1}{2000}\\\Rightarrow v_2=-0.5\ mph

The speed of the impact is given by 0.5 mph in the opposite direction

8 0
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A stone is thrown with an initial speed of 11.5 m/s at an angle of 50.0 above the horizontal from the top of a 30.0-m-tall build
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Answer:

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Explanation:

Given that,

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Angle = 50.0

Height = 30.0 m

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Using formula of horizontal component

v_{x}=u\cos\theta

Put the value into the formula

v_{x}=11.5\times\cos50

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Hence, The magnitude of the horizontal displacement of the rock is 7.39 m/s.

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