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Nesterboy [21]
3 years ago
7

If on average you walk 1.20 meters every second , how long do you walk i one hour?

Physics
2 answers:
AlexFokin [52]3 years ago
8 0

Answer:

Explanation:

En cuánto tiempo se pueden caminar 20 km? Una persona sana, acostumbrada a andar camina a unos 4 o 5 kilómetros/hora, en terreno llano. Puede tardar 5 horas o 4.

frutty [35]3 years ago
4 0

Answer:

4,320meters

Explanation:

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4 years ago
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A carpenter builds an exterior house wall with a layer of wood 3.0 cm thick on the outside and a layer of Styrofoam insulation 2
Leno4ka [110]

Answer:

A. T=15.54 °C

B. Q/A= 0.119 W/m2

Explanation:

To solve this problem we need to use the Fourier's law for thermal conduction:

Q= kA\frac{dT}{dx}

Here, the rate of flow per square meter must be the same through the complete wall. Therefore, we can use it to find the temperature at the plane where the wood meets the Styrofoam as follows:

\frac{Q}{A} =\frac{T_1-T_0}{d_w}k_w=\frac{T_2-T_1}{d_s}k_s\\T_1(\frac{k_w}{d_w}+\frac{k_s}{d_s})=T_2\frac{k_s}{d_s}+T_0\frac{k_w}{d_w}\\T_1=\frac{T_2\frac{k_s}{d_s}+T_0\frac{k_w}{d_w}}{\frac{k_w}{d_w}+\frac{k_s}{d_s}}\\T_1= 15.54 \°C

Then, to find the rate of heat flow per square meter, we have:

\frac{Q}{A}=\frac{T_1-T_0}{d_w}k_w=0.119 \frac{W}{m^2}\\\frac{Q}{A}=\frac{T_2-T_1}{d_s}k_s= 0.119 \frac{W}{m^2}

T_0: Temperature \ in \ the \ house\\T_1: Temperature \ at \ the \ plane \ between \ wood \ and \ styrofoam\\T_2: Temperature \ outside\\k_w: k \ for \ wood\\d_w: wood \ thickness\\k_s: k \ for \ styrofoam\\d_s: styrofoam \ thickness

7 0
3 years ago
PLEASE HELP!!
astraxan [27]

Answer:

Explanation:

\lambda\\ = v/f

^That is the formula we are going to use.

Now, we were given the speed (v), which is 20.

Now we need to find frequency, in order to solve for the wavelength.

Frequency is the amount of waves in a fixed unit of one second, meaning our F value is the value of 5 divided by 4.

5/4 = 1.25

Therefore our F is 1.25

Now lets plug it in

\lambda\\ = v/f

\lambda\\ = 20/1.25

\lambda\\ = 16

Conversion:

\lambda\\ = 8

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3 years ago
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Natasha_Volkova [10]

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7 0
3 years ago
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A parallel circuit has three branches. Each branch has a resistance of 37.5 ohms. The total current is 7.5 amps. What is the cur
Sophie [7]

Answer:

Current in each branch will be 2.5 A

Explanation:

We have given that a circuit has three branch each has a resistance of 37.5 ohm

We have also given that a total current of 7.5 A is flows through the circuit

As we know that in parallel circuit total current is the sum of current flowing through each branch

As the resistances of each branch is same so current will also be same

As there is 3 branches in circuit so current in each branch will be \frac{7.5}{3}=2.5A

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