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Zielflug [23.3K]
3 years ago
5

You are a mechanic in a garage and are working on a carburetor that is made of metal, has a glass inspection window and plastic

gears for the choke. If all three types of material are at the same temperature and each type of material is in contact with the other two, then
A. heat will flow from the plastic to the glass, and from the glass to the metal.
B. heat will flow from the metal to the glass, and from the glass to the plastic.
C. heat will flow from the glass to both the plastic and the metal.
D. no heat will flow between any parts.
Physics
1 answer:
kherson [118]3 years ago
5 0

Answer:

The correct option is;

D. no heat will flow between any part

Explanation:

Here, we are required to know the thermal conductivity of the three materials

1. Metal

2. Glass and

3. Plastic

The thermal conductivity of the above materials are

1. Metal e.g Iron = 0.163 cm² C/cm = 79.5 W/(m K)

2. Glass = 0.0025 cm² C/cm = 0.8 W/(m K)

3. Plastic = 0.19 W/(m K)

Therefore due to the very low conductivity of the glass and the plastic, there will be no heat flow between the parts.

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Two points are given in polar coordinates by : (r, θ) = (2.60 m, 50.0°)
alukav5142 [94]

Answer:

The distance between the 2 points is 4.6558 meters.

Explanation:

The distance between 2 points (r_1,\theta _1),(r_2,\theta _2) is given by

d=\sqrt{r_{1}^{2}+r_{2}^{2}-2r_1\cdot r_2cos(\theta _2-\theta _1)}

In our case the given 2 points are (2.60,50.0^{o}),(3.60,-46.0^{o}) hence the distance is

d=\sqrt{2.60^{2}+3.60^{2}-2\cdot 2.60\cdot 3.60\cdot cos(-46.0-50)}\\\\\therefore d=4.6558m

5 0
3 years ago
A zone reconnaissance involves a directed effort to obtain detailed information on all routes, obstacles, terrain, enemy forces,
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Answer:

It is True

Explanation:.

A  commander assigns a zone reconnaissance mission when he seeks additional information on a zone before committing other forces in the zone. It is appropriate when the enemy situation is vague,  existing knowledge of the terrain is limited, or combat operations have altered the terrain. A zone  reconnaissance could include several route or area reconnaissance missions assigned to subordinate units.

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Given a 45 45 90 prism with index of 1.5, immersed in air. The hypotenuse acts as the reflecting face by TIR. A ray of light ent
Genrish500 [490]

Answer:

83.6°

Explanation:

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n₁sinθ₁ = n₂sinθ₂ where n₁ = refractive index of prism = 1.5, θ₁ = critical angle in prism, n₂ = refractive index of air = 1 and θ₂ = refractive angle = 90°.

So, substituting these values into the equation,

n₁sinθ₁ = n₂sinθ₂

1.5 × sinθ₁ = 1 × sin90

1.5 × sinθ₁  = 1

sinθ₁ = 1/1.5

sinθ₁ = 0.6667

θ₁  = sin*(0.6667)

θ₁  = 41.8°

So, for total internal reflection, an incidence angle of 41.8° is required. So, a full convergence angle of 2 × 41.8° = 83.6° is required for the whole bundle of rays.

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