The fermi energy of silver is given as 5.49 eV. a) Find the densities of electron and atom per volume. b) Find the fermi velocity of electron in silver c) The current value flowing through silver is 2 A. The cross sectional area of silver is 0.5 cm2. Find the drift velocity of electron in silver according to given conditions. d)Find the collision time  for an electron for sliver. (the definition of current density is the current per cross sectional area, the resistivity value of silver is 1.59x10-8 ohm.m,)

Q 1. (25 pts) A constant pressure container is filled with 1 kg of stainless steel and 0.5 kg of PVC (polyvinyl chloride) both at 20C and 0.25 kg of hot air at 500 K, 100 kPa. The container is now left alone with no external heat transfer.
a. Find the final temperature.
b. Find the process work.

pls sol 20 minute

1. Research and explain more about carbon and heat treatment effects on steel.

You are going up an elevator to reach the top of the Stratosphere casino in Las Vegas. The elevator has a mass of 900 kg. It initially starts accelerates, while moving upwards with an initial velocity of 10 m/s until it comes to rest at a height of 40 m. You have a mass of 50 kg.
a) Draw two FBD one of the elevator and one of you in the elevator. [4 points]
b) Determine the Tension force of the cable on the elevator. [6 points]
c) Determine the magnitude of the normal force you feel from the elevator [2 points]
d) Is the normal force the same as your weight? Why or why not

explain the difference of metal, semiconductor, and isolator based on the structure of energy band

Be able to explain how to find the allowed degrees of freedom for monatomic and diatomic molecules and the relationship between Cv and Cp

5) Derive 22.17 (22.7)

delta S= nR ln (Vf/Vi) (serway physics 9th)

6) Derive 22.18 (22.7)

delta S= Q(1/Tc - 1/Th) >0

A person holds a ladder horizontally at its center.

Treating the ladder as a uniform rod of length 3.10 m and mass 8.56 kg , find the torque the person must exert on the ladder to give it an angular acceleration of 0.238 rad/s2 .

Fusion is the process by which the sun produces energy. One experimental technique for creating controlled fusion utilizes a solid-state laser that emits a wavelength of 1150 nm and can produce a power of 1.00

electron and hole of an intrinsic semiconductor of Germanium (Ge) each is 0.39 and 0.19 m^2/V.s

a. find the concentration of the carrier and Ge conductivity at 300 K if the gap energy of Ge is 0.67 eV and the effective mass of electron and hole is 0.55 m0 and 0.37m0 respectively. where m0 is the mass of a still electron)

b. calculate the doping concentration (in m^-3) that must be added to Ge so that the conductivity increase up to 10^4 times

Find the all the bound state energies for the potential V = - Vo

explain the importance of knowledge of quantitative techniques to the ethical outcomes of quantitative research

Using Archimedes's Principle. A solid, homogeneous sphere with a mass of m0, a radius of r0, and a density of ρ0 is placed in a container of water. Initially the sphere floats and the water level is marked on the side of the container. What happens to the water level, when the original sphere is replaced with a new sphere which has different physical parameters? Notation: r means the water level rises in the container, f means falls, s means stays the same. Combination answers like 'r or f or s' are possible answers in some of the cases.

The new sphere has a mass of m < m₀ and a radius of r > r₀.
The new sphere has a density of ρ > ρ₀ and a mass of m < m₀.
The new sphere has a density of ρ > ρ₀ and a radius of r < r₀.

A) A plastic block that has a length of 0.5 m, a width of 0.26 m, and a height of 0.33 m, and has a density of 670 kg/m3 floats in both water and oil. If the plastic block is floating at the surface of a tank of water (which has a density of 1000 kg/m3), what is the distance from the top of the block to the surface of the water?If the plastic block is floating at the surface of a tank of oil (which has a density of 900 kg/m3), what is the distance from the top of the block to the surface of the oil?

B) A cargo barge is loaded in a saltwater harbor for a trip up a freshwater river. If the rectangular barge is 2.50 m by 20.0 m and sits 0.800 m deep in the saltwater harbor, how deep will it sit in the freshwater river?