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The differential of thermal energy of a surface of a liquid with surface tension y and area A may be written as dU = Tds + ydA Write down the corresponding differential form of the Helmholtz free energy, F=U-TS.
When a potential difference of 221 V is applied to two plates of a parallel-plate capacitor, the inner surface of the positive plate carries a surface charge density of 40 nC/cm2. What is the spacing between the plates
Suppose that you want to take a photograph of yourself as youlook at your image in a flat mirror 2.5 m away. For what distance should the camera lens be focused
While exploring a sunken boat the principal researcher found the absolute pressure on the exploring devide at the level of the boat about 413 atm the density of the seawater is 1025 kg/mcubed
A wodden raft has a density of 0,5*10^3kg/m^3 and dimension of 3,05m*6,1m*0,305m. How deep does it sink into the water when unloaded
a super-particle travels forward along a straight cylindrical tube at 1000 m/s for 10 m, What is the average velocity
When a 5.5 cm long pencil is arranged perpendicular to a convex mirror's optical axis at a distance of 29 cm from the mirror, its image is 2.8 cm tall. (a) What is the mirror's focal length? (b) How tall is the pencil's image if the pencil is move..
A vertical straight wire carrying an upward26-A current exerts an attractive force per unit length of 7.3×10?4N/m, What is the direction of the current in the second wire?
A irregular piece of metal has a dry mass of 5.7 kg. Once it is submerged it has an apparent mass of 2.4 kg. What is the density of the piece of metal
An elevator has mass 670 kg, not including passengers. What is the maximum number of passengers that can ride in the elevator
A coin with a diameter of 1.7 cm is dropped on its edge onto a horizontal surface. It starts rolling with an initial angular speed of 15.3 rad/s and rolls in a straight line without slipping.
A point source of light illuminates an aperture 1.96 m away. How wide is the aperture
A neutral sodium atom has an ionization potential of ? = 5.1 eV. What is the temperature T of a gas in which the average particle kinetic energy is just barely sufficient to ionize a sodium atom in its ground state?
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