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Mara

Circuit Analysis

January 30, 2023
HERRERA

Circuit Analysis

September 11, 2021
Albenis

Current Electricity: Mesh Rule

August 6, 2021
Iriam

Current Electricity: Mesh Rule

August 4, 2021
Abhigyan Martin Ninama

Rotational Motion

September 8, 2017

. : "Heat and Thermodynamics"

Radiation: Stefan Law

June 1, 2017

Q- The surface of the sun has a temperature of about 5800K. The radius of the Sun is 6.96 X 10⁸ m. Calculate the total energy radiated by the sun each second. Assume the emissivity is 0.986.

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Gas Laws

February 9, 2017

Q- At some place the temperature of air is 20 degrees C and the pressure is 1.021*10⁵ Pa. Calculate the density of air.

Solution:

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Q- A 3.00-g lead bullet at 30.0 degrees C is fired at a speed of 240 m/s into a large block of ice at 0 degrees C, in which it embeds itself. What quantity of ice melts? (Specific heat capacity of lead is 128 J/kg/⁰C and latent heat of melting of ice is 333*10³ J/kg)

Solution:

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Thermodynamics

January 20, 2017

Q- The initial state of 1.00 mol of a gas is P₁ = 6.00 atm, V₁ = 5.00 L, and E_int₁ = 790 J, The gas is allowed to expand at constant pressure to a volume of 9.00 L. It is then cooled at constant volume until its pressure is 4.00 atm and its final state becomes P₂ = 4.00 atm, V₂ = 9.00 L, and E_int₂

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Thermal physics

January 10, 2017

Q-(a) If the pressure of a gas is increased by a factor of 9, while its volume is held constant, by what factor does rms speed change?(b) In Joule’s experiment, the mass of the weights is 2.99 kg, and the insulated tank is filled with 0.137 g of water. What is the increase in the temperature of the …

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Thermal Physics: Boyle's Law

December 16, 2016

Q- A scuba diver releases a 2.50 cm diameter (spherical) bubble of air from a depth of 15 m in a lake. Assume the temperature is constant at 16.0⁰C, and the air behaves as a perfect gas. What is the diameter of the bubble when it reaches the surface?

Solution:

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Heat Engine

October 31, 2016

(On request Dyllzey)

Q- A gas is taken through the cycle as shown in the figure. Find

(a) Change in internal energy of the gas during one cycle

(b) Work done on the gas during one cycle

Solution:

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Thermal Physics: Gas Law

October 21, 2016

Q- A cylinder of hydrogen, 2m in height and with a 25cm diameter, is dropped and develops a crack of size 0.1 mm². The gas is stored at 10 bar absolute pressure. Estimate how long it takes for half the contents to leak out. Explain your reasoning and assumptions.

Solution:

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Thermal Radiations

June 18, 2016

Q- The radius of the Sun is 6.96 x 10⁸ m and the total power output from its surface is 2.51 x 10²⁶ W.
(a) Assuming that the Sun acts like a black body, calculate its surface temperature.
(b) What is the maximum wavelength of radiation from the Sun?

Solution:

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Heat Engine

June 14, 2016

Q- One mole of an ideal monatomic gas is used as the working substance in an engine. The engine operates on the cycle shown in the diagram. Processes BC and DA are reversible and adiabatic. What is the efficiency of the engine?

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. : "Heat and Thermodynamics"