Molecular Physics | Thermodynamics Answers

Nicholas Mason inflated a weather balloon using just the power of his lungs. The balloon’s final radius was 1.22 m. If 642 kJ of work was done to inflate the balloon, at what net pressure was the balloon inflated?

A system with just two energy levels in thermal equilibrium with a heat reservior at temp. 600°k .The energy gap between the level is 0.1 eV. Find the probability that the system is in higher energy level.

A 1.0kg sample of steam is cooled from 110 degree celsius to 40 degree celsius. How much energy must be withdrawn for this to occur?

Two metallic spheres P and Q made of same material have same smoothness but the weight of P is 8 times that of Q. If the two are heated to same temperature and left to cool then the ratio of rate of cooling of Q to that of P is

ans 2:1

During a non-flow process 120 Btu of heat is removed from each lbm of the working substance while the internal energy of the working substance decreases by 85.5 Btu/lbm. Determine how much work is involved in the process and indicate whether the work is done on or done by the working substance.

Millikan's oil drop experiment the mass of the oil drops is obtained by observing the terminals Vt of a freely falling drop in the absence of an electric field. under the circumstances the effective weight equals the viscous Force given by stroke's law F= 6ie ΠrVr where Π is 1.8 * 10 - 5 kg/m.s is the viscosity of air and r is 0.65 cm is the of the radius of the drop . Also the actual with Mg =⁴÷² pie r³ density gram. must be corrected for the buoyant force of the air this is done by replacing density with density -densityA .density is 9.20 x 10² kg/m³ the density of the oil and density is 1.29 kg/m³ density of air with this premier a show that charge drop is given by

A nozzle is a device for increasing the velocity of a steadily flowing stream. At the inlet to a certain nozzle, the enthalpy of the fluid passing is 3025 kJ/kg and the velocity is 60 m/s. At the discharge end, the enthalpy is 2790 kJ/kg. The nozzle is horizontal and there is negligible heat loss from it.

a)Find the velocity of the fluid at the exit.


(b the rate of flow of fluid when the inlet area is 0.1 m^2 and the specific volume at inlet is 0.19 m^3/kg,


(c) the exit area of the nozzle when the specific volume at the nozzle exit is 0.5 m^3/kg

A cube of green jelly rests on a table. The jelly is pushed laterally with a

force of 30 N at it top surface and changes into a parallelogram shape

instead of sliding, with a lateral displacement of 0.125 m. Calculate the

shear strain induced in the cube of jelly

In a router for scattering experiment and alpha particle is positive charge 2 is directed towards a gold necklace with charms 79-80 alpha particle has a kinetic energy of 5.0 even went very far from the nucleus as even the Golden close to be fixed and space determine the distance of the closest approach note 8.99 * 10 is 4 and 9 Newton per hour metre square column column

feed water enters a boiler drum at 700 psia, 300°F and a specific volume of 0.0174 ft^3/lb. steam leaves the superheater of the boiler at 600 psia, 550°F and a specific volume of 0.8794 ft^3/lb. calculate: a. the flow work in BTU/lb associated with the water entering the boiler drum, b. the flow in BTU/lb associated with the steam leaving the superheater