Thermodynamics

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New answer posted•a year ago

Thermodynamics Class 11th

The specific heat of water $= 4200 J {k g}^{- 1} K^{- 1}$ $^{}^{}$ and the latent heat of ice $= 3.4 \times 10^{5} J {k g}^{- 1}$ $^{}^{}$ . 100 grams of ice at $0^{?} C$ $^{}$ is placed in $200 g$ of water at $25^{?} C$ $^{}$ . The amount of ice that will melt as the temperature of water reaches $0^{?} C$ $^{}$ is close to (in grams):

6 Views|Posted a year ago

Asked by Vishal Baghel

Answered by

Vishal Baghel | Contributor-Level 10

a year ago

$m (L) = m_{1} S_{1} (Δ T)$

$\Rightarrow m (3.4 \times 10^{5}) = (200) (4200) (25)$

$\Rightarrow m = 61.7$

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New answer posted•a year ago

Thermodynamics Class 11th

A metallic sphere cools from $50^{\circ} C$ to $40^{\circ}$ in 300 s. If atmospheric temperature around is $20^{\circ} C$ , then the sphere's temperature after the next 5 minutes will be close to:

14 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

$\frac{50 - 40}{300} = - k [\frac{50 + 40}{2} - 20]$

$\begin{array}{r} \frac{40 - T}{300} - k [\frac{T + 40}{2} - 20] \\ \Rightarrow \frac{10}{40 - T} = \frac{25}{T} \times 2 \\ \Rightarrow T = 200 - 5 T \\ \Rightarrow T = \frac{100}{3} \approx 33^{?} C \end{array}$

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New answer posted•a year ago

Thermodynamics Class 11th

A balloon filled with helium (32°C and 1.7 atm.) bursts. Immediately afterwards the expansion of helium can be considered as:

2 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

After burning, heat exchange occurs between helium and atmospheric. Hence, irreversible, isothermal process.

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New answer posted•a year ago

Thermodynamics Class 11th

Consider a gas of triatomic molecules. The molecules are assumed to be triangular and made of massless rigid rods whose vertices are occupied by atoms. The internal energy of a mole of the gas at temperature T is:

13 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

The internal energy of one mole of an ideal gas is given by U = (f/2)RT, where f is the number of degrees of freedom.
For a non-linear triatomic molecule (assumed to be a rigid rotator), there are:

3 translational degrees of freedom.

3 rotational degrees of freedom.
Vibrational modes are generally not c

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New question posted•a year ago

Thermodynamics Class 11th

Consider a gas of triatomic molecules. The molecules are assumed to be triangular and made of massless rigid rods whose vertices are occupied by atoms. The internal energy of a mole of the gas at temperature T is:

8 Views|Posted a year ago

Asked by Alok Kumar Singh

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The specific heat of water = 4200 J k g - 1 K - 1 and the latent heat of ice = 3.4 × 10 5 J k g - 1 . 100 grams of ice at 0 ? C is placed in 200 g of water at 25 ? C . The amount of ice that will melt as the temperature of water reaches 0 ? C is close to (in grams):

A metallic sphere cools from 50 ∘ C to 40 ∘ in 300 s. If atmospheric temperature around is 20 ∘ C , then the sphere's temperature after the next 5 minutes will be close to:

A balloon filled with helium (32°C and 1.7 atm.) bursts. Immediately afterwards the expansion of helium can be considered as:

Consider a gas of triatomic molecules. The molecules are assumed to be triangular and made of massless rigid rods whose vertices are occupied by atoms. The internal energy of a mole of the gas at temperature T is:

<p><strong>Consider a gas of triatomic molecules. The molecules are assumed to be triangular and made of massless rigid rods whose vertices are occupied by atoms. The internal energy of a mole of the gas at temperature T is:</strong><br><br>&lt;!--[endif]--&gt;</p>

A metallic sphere cools from $50^{\circ} C$ to $40^{\circ}$ in 300 s. If atmospheric temperature around is $20^{\circ} C$ , then the sphere's temperature after the next 5 minutes will be close to:

A balloon filled with helium (32°C and 1.7 atm.) bursts. Immediately afterwards the expansion of helium can be considered as:

<p><strong>Consider a gas of triatomic molecules. The molecules are assumed to be triangular and made of massless rigid rods whose vertices are occupied by atoms. The internal energy of a mole of the gas at temperature T is:</strong><br><br></p>