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tatyana61 [14]
2 years ago
10

Which statement best describes the relationship between an object's density and its index of refraction? as the optical density

increases, the refractive index decreases. as the tendency of the atoms to absorb energy before reemitting it increases, the refractive index increases. as the mass per unit volume of the substance increases, the refractive index decreases. as the physical density of the substance increases, the refractive index increases.
Physics
2 answers:
tino4ka555 [31]2 years ago
7 0

Answer:

as the tendency of the atoms to absorb energy before reemitting it increases, the refractive index increases.

Explanation:

The process of being absorbed and re-emitted by the atoms of the material decreases the speed of light from one end of the medium to the other. Therefore, the higher the absorption, the lower its speed in any medium with respect to the speed of light in a vacuum. The index of refraction indicates how slow the light in the material is compared to its speed in a vacuum. Thus, if the atoms absorb more energy before reemitting it increases, the refractive index increases

babunello [35]2 years ago
4 0
For future references, the answer is B.
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A helicopter carries a 1000-kg-car suspended from a rope below it. The helicopter flies horizontally at a constant speed of 25 m
kolbaska11 [484]

Answer:

(a) Tension, T = 28.653 kN

(b) Wind resistance force, 26.925\ kN

Solution:

As per the question:

Mass of the car, m = 1000 kg

Speed of the helicopter, v = 25 m/s

Angle made by the rope, theta = 20^{\circ}

Now,

(a) To calculate the tension, T in the car:

Tension along the direction of motion, T_{h} = Tcos20^{\circ}

Tension along the vertical direction, T_{v} = Tsin20^{\circ}

Now, let the force due to the wind directed in the opposite direction of the motion be F_{W} and it balances the horizontal component of the tension, T.

The vertical component is balance by the weight of the car, i.e., mg that acts vertically downwards.

Now,

T_{v} = mg

Tsin20^{\circ} = 1000\times 9.8

T = 28653 N = 28.653 kN

(b) The force of the wind resistance:

F_{W} = T_{h}

F_{W} = 2cos20^{\circ} = 26925\ N = 26.925\ kN

(c) Now,

  • If the angle made by the rope with the vertical is 0^{\circ}:

mg = Tsin(90^{\circ} - 0^{\circ})

Tsin90^{\circ} = mg = 9800\ N

The tension in the rope will be equal to the weight the car.

Wind resistance force, F_{W} = Tcos90^{\circ} = 0\ N

  • If the angle made by the rope with the vertical is 90^{\circ}:

mg = Tsin(90^{\circ} - 90^{\circ})

T = 0 N

Wind resistance force, F_{W} = Tsin0^{\circ}

Tsin0^{\circ} = mg

F_{W} = \infty

There will be no tension in the rope and wind resistance will be infinite.

3 0
3 years ago
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Answer:

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Explanation:

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= current x time  

= 2 x 10⁻³ A x 5 x 10⁻³

=  10⁻⁵ C

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10⁻⁵ / .1 x 10⁻⁶

= 10² V

= 100 V

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99 V .

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Ierofanga [76]

Answer:

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