Molecular Physics | Thermodynamics Answers

The temperature of an ideal gas in a sealed 0.40m³ rigid container is reduced from 350 K to 270 K.The final pressure of the gas is 60 kPa. The molar heat capacity at constant volume of the gas is 28.0 J/(mol K). The heat absorbed by the gas is closest to

• A. -24 kJ.
•  B. -31 kJ.
•  C. 24 kJ.
•  D. 31 kJ.
•  E. None of the above.

The temperature of an ideal gas in a sealed 0.40m³ rigid container is reduced from 350 K to 270 K.The final pressure of the gas is 60 kPa. The molar heat capacity at constant volume of the gas is 28.0 J/(mol K). The heat absorbed by the gas is closest to

• A. -24 kJ.
•  B. -31 kJ.
•  C. 24 kJ.
•  D. 31 kJ.
•  E. None of the above.

Determine the resultant of the three forces acting on the gusset plate of a truss.

. Spherically symmetric charge distribution. Fig. 3-15 shows a spherical distribution of charge of radius R. The charge density  at any points depends only on the distance of the point from the center and not on the direction, a condition called spherical symmetry. Find an expression for E for points (a) outside and (b) inside the charge distribution. Note that the object in Fig. 3-15 cannot be a conductor. 

The charges and coordinates of two charged particles held fixed in the x-y plane are: q1 = +3.0x10^-6 C; x = 3.5, y = 0.5 cm, and q2 = - 4.0x10-6 C; x = - 2.0 cm, y = 1.5 cm. (a) Find the magnitude and direction of the force on q2. (b) where could you locate the third charge q3 = + 4.0x10^-6 C such the total force on q2 is zero? 

An electron is projected as in fig. 3-10 at a speed of 6.0106 m/s at an angle  of 45o ; E = 2.0103 N/C (directed upward), d = 2.0 cm, and l = 10.0 cm. (a) Will the electron strike either of the plates? (b) If it strikes a plate, where does it do so? 

Let 5.0 cal of heat is added to a particular substance. As a result, its volume changes from 50 to 100 cm3 while the pressure remains constant at 1.0 atm. (a) By how much did the internal energy of the substance? (b) If the mass of the substance is 2.0x10-3 mol, find the molar heat capacity at constant volume. (c) Find the molar heat capacity at constant pressure

A runner of mass 60 kg accelerates at 2.0 m/s² at the start of a race. Calculate the force provided from her legs.

1. A warehouse worker moves a crate weighing 100 N vertically a distance of 1.0 m from the floor to a shelf.  The worker then slides the crate 3.0 m horizontally along the shelf.  Determine the total amount of work exerted on the crate.

a block of wood and a 0.90 kg block of steel are placed in thermal contact while thermally isolated from their surroundings of the the wood was at an initial temperature of 40 degrees the steel was at an initial temperature of 60 degrees and the final equilibrium temperature of the wood and steel was 45 degrees then what was the mass of the block of wood