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elena-14-01-66 [18.8K]
3 years ago
7

How do you calculate heat resistance

Physics
1 answer:
lisov135 [29]3 years ago
7 0

Answer:

Thermal Resistance (R-Value)

According to this definition and Equation 1, Equation 2, therefore, can be obtained. As indicated in Equation 2, the value of the thermal resistance can be determined by dividing the thickness with thermal conductivity of the specimen.

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A wire with a linear mass density of 1.17 g/cm moves at a constant speed on a horizontal surface and the coefficient of kinetic
stira [4]

Answer:

The value is B  =  0.2312 \  T

The direction is into the surface

Explanation:

From the question we are told that

   The mass density is  \mu =\frac{m}{L}  = 1.17 \ g/cm =0.117 kg/m

   The coefficient of kinetic friction is  \mu_k  =  0.250

   The current the wire carries is  I =  1.24 \  A

Generally the magnetic force acting on the wire is mathematically represented as

         F_F   = F_B

Here   F_F is the frictional  force which is mathematically represented as

      F_F =  \mu_k *  m *  g

While F_B  is the magnetic force which is mathematically represented as

       F_B  = BILsin(\theta )

Here \theta =90^o is the angle between the direction of the force and that of the current

So

      F_B  = BIL

So

      BIL  =  \mu_k * m * g

=>   B  =  \mu_k *  \frac{m}{L} * [\frac{g}{I} ]

=>   B  =  0.25 *  0.117  * [\frac{9.8}{1.24} ]

=>   B  =  0.2312 \  T

Apply the right hand curling rule , the thumb pointing towards that direction of the current we see that the direction of the magnetic field is into the surface as shown on the first uploaded image

8 0
3 years ago
Which statement correctly compares infrared light to ultraviolet light
allochka39001 [22]
I am fairly certain it's D. Good luck!
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3 years ago
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When resistance force is increased on a lever which of the following happens to the effort force?
Sauron [17]
When resistance force on a lever increases, nothing happens automatically. 
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3 years ago
Infrared radiation from young stars can pass through the heavy dust clouds surrounding them, allowing astronomers here on Earth
liberstina [14]

Answer:

λ = 1.86 x 10⁻⁴ m = 186 μm

Explanation:

The relationship between the wavelength and the frequency of a wave is given by the following equation:

c = f\lambda\\\\\lambda = \frac{c}{f}

where,

λ = wavelength of infrared radiation = ?

c = speed of infrared radiation = speed of light = 3 x 10⁸ m/s

f = frequency of infrared radiation = 1.61 THz = 1.61 x 10¹² Hz

Therefore,

\lambda = \frac{3\ x\ 10^8\ m/s}{1.61\ x\ 10^{12}\ Hz}

<u>λ = 1.86 x 10⁻⁴ m = 186 μm</u>

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Would talking to plants positively or negative affect how they grow?
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u go to vanguard? in 6th grade

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