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Orlov [11]
2 years ago
8

To heat the water in the tank from 50°C to 58°C the immersion heater transfers

Physics
1 answer:
LenKa [72]2 years ago
4 0

Let's see

  • ∆T=58-50=8°C

So

\\ \rm\Rrightarrow Q=mc\Delta T

\\ \rm\Rrightarrow 4032=4200(8)m

\\ \rm\Rrightarrow 4032/8=4200m

\\ \rm\Rrightarrow 504=4200m

\\ \rm\Rrightarrow m=0.12kg

\\ \rm\Rrightarrow m=120g

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A wire of Nichrome (a nickel– chromium– iron alloy commonly used in heating elements) is 1.0 m long and 1.0 mm² in cross-se
Lyrx [107]

Answer:

The conductivity of Nichrome is 2\times 10^6\ S/m.

Explanation:

Given:

Potential difference (V) = 2.0 V

Current flowing (I) = 4.0 A

Length of wire (L) = 1.0 m

Area of cross section of wire (A) = 1.0 mm² = 1 × 10⁻⁶ m² [1 mm² = 10⁻⁶ m²]

We know, from Ohm's law, that the ratio of voltage and current is always a constant and equal to the resistance of the resistor. Therefore, the resistance of the nichrome wire is given as:

R=\frac{V}{A}=\frac{2.0}{4.0}=0.5\ \Omega

Now, resistance of the nichrome wire in terms of its resistivity, length and area of cross section is given as:

R=\rho\frac{L}{A}

Where, \rho\to resistivity\ of\ Nichrome

Now, plug in all the values given and solve for \rho. This gives,

0.5\ \Omega=\rho\frac{1.0\ m}{1\times 10^{-6}\ m^2}\\\\\rho=\frac{0.5\times 1\times 10^{-6}}{1.0}=0.5\times 10^{-6}\ \Omega-m

Now, conductivity of a material is the reciprocal of its resistivity. Therefore, the conductivity of Nichrome is given as:

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Therefore, the conductivity of Nichrome is 2\times 10^6\ S/m.

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3 years ago
) you carry a 7.0 kg bag of groceries 1.2 m above the ground at constant velocity across a 2.7 m room. how much work do you do o
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M = 7.0 kg, the mass of the groceries
h = 1.2 m, the elevation of the bag of groceries

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The change in PE is equal to the work done.

Answer: 82.3 J

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Answer:

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