Molecular Physics | Thermodynamics Answers

A ball of mass 0.150 kg is dropped from rest froma height of 1.25m .it rebounds from the floor to reach a height of 0.960m .what impulse was given to the ball by floor?

Four sled dogs are pulling a 1000kg load. Sled dog A is pulling the load at 20N, 10 degrees north of east. Sled dog B is pulling the load at 55N, 70 degrees north of east. Sled dog C is pulling the load at 45N, 33 degrees north of west, while sled dog D exerts 30N at a direction of 80 degrees south of west. What is the resultant force acting on the load?

Determine the temperature T given that the length of mercury thread on the triple point is 7.8 cm, X_T = 5.6 cm.

A gas with a velocity of 300 m/s is flowing through a horizontal pipe at a

section where pressure is 78 kN/m2 absolute and temperature 40°C. The pipe changes in diam￾eter and at this section, the pressure is 117 kN/m2 absolute. Find the velocity of the gas at this

section if the flow of the gas is adiabatic. Take R = 287 J/kg K and γ = 1.4

. Find the sonic velocity for the following fluids :

(i) Crude oil of specific gravity 0.8 and bulk modulus 1.5 GN/m2 ;

(ii) Mercury having a bulk modulus of 27 GN/m2.

. A supersonic aircraft flies at an altitude of 1.8 km where temperature is

4°C. Determine the speed of the aircraft if its sound is heard 4 seconds after its passage over the

head of an observer. Take R = 287 J/kg K and γ = 1.4

A projectile is travelling in air having pressure and temperature as

88.3 kN/m2 and – 2°C. If the Mach angle is 40°, find the velocity of the projectile. Take γ = 1.4 and

R = 287 J/kg K.

An aeroplane is flying at 1000 km/h through still air having a pressure of

78.5 kN/m2 (abs.) and temperature – 8°C. Calculate on the stagnation point on the nose of the

plane :

(i) Stagnation pressure,

(ii) Stagnation temperature, and

(iii) Stagnation density.

Take for air : R = 287 J/kg K and γ = 1.4