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liraira [26]
3 years ago
15

A very good insulator has an R-value of 29. The material's heat transfer coefficient is

Physics
1 answer:
Fittoniya [83]3 years ago
4 0

Answer:

b. 0.034

Explanation:

The heat transfer coefficient of a material (U-value) is equal to the reciprocal of its R-value, therefore:

U = \frac{1}{R}

where

R is the R-value of the material

For the insulator in this problem,

R = 29

Substituting into the equation, we find the heat transfer coefficient:

U=\frac{1}{29}=0.034

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You are working in cooperation with the Public Health department to design an electrostatic trap for particles from auto emissio
Mademuasel [1]

Answer:

Explanation:

Given that:

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at a distance x = 15 cm , the velocity in the plate = 900 m/s²

For the square plate, the surface charged density σ = -8 × 10⁻⁶ C/m²

To start with calculating the electric field as a result of the square plate; we use the formula;

E = \dfrac{\sigma }{2 \varepsilon_o}

E = \dfrac{8 \times 10^{-6} }{2 \times  8.85 \times 10^{-12}}

E = 4.51977 \times 10^5 \ V/m

On the square plate; The electric force F = Eq

F = (4.51977 \times 10^5 \ V/m )(3\times 10^{-8} \ C)

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The acceleration a =\dfrac{ F}{m}{

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a = 2.25988 \times 10^6 \ m/s^2

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v^2 = 64568142.86  \ m/s

v =\sqrt{ 64568142.86  \ m/s}

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From the calculation, we realize that the charge acting between the particle and the plate is said to be "opposite".

Hence, the force is an attractive force.

Similarly, there is a gradual increase exhibited by the velocity of the particle.

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3 years ago
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Answer:

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If you had a 14 m long timeline, the dinosaurs would be less than one meter from the end.

<h3>What is extinction of species?</h3>

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