Question

Explain what the physical meaning of a differential scattering
cross section is, as well as a total scattering cross section.
Estimate the size of a total cross section for 1) gravitational, 2)
electromagnetic, 3) strong, or 4) weak.

Answer #1

Explain Born approximation. Apply the method to calculate the
scattering cross-section from a screened coulomb field.
Discuss the validity of the result.

a. Write the definitions of the microscopic and macroscopic
cross sections
b. What is the inverse of the macroscopic cross-section signify
in terms of interaction probability?
c. If the macroscopic neutron scattering cross-section is 0.1
cm-1 , how far will a neutron travel on average before a
collision will take place?
d. For a thermal LWR, how would the size of the reactor vary
with the scattering mean free path?

1. (a) explain the physical meaning of affinity.
(b) What is the value in chemical equilibrium?
(c) as reactant species are consumed more, is the affinity
reduced or increased? Show your reasoning. (10 points)
2. Calculate the Gibbs Free Energy Change and evaluate the
possibility of the following reaction:
CH4 (g) + 2O2 (g) à CO2 (g) +
2H2O (l) (15 points)

Explain the meaning of the average velocity
equation in words and describe what physical quantity each of the
algebraic symbols in the equation refers to. Then connect the
concept of displacement to a specific incident in
your life, and explain how your earlier experience helps you to
make sense of said concept.

1.What is the chemical equation for titration of 3m of naOH into
1M HF including physical states?2.
2.What is the chemical equation for titration of 3M of NaOH into
1M of HCl including physical states?
2a. Does the titration of a Strong Acid with a Strong Base form
a buffer? Explain. (Consider the products of the reaction in your
explanation.)
2c. 4. What is the equivalence point of any
titration of Strong Acid with Strong Base?

A rod has a square cross section of (5 x 5) mm. length of the
rod is 120 cm. The allowable stress is 400 MPa. After applying the
load (F), square section changes to (4.95 x 4.95) mm.
1. What is the type of the load (F), is it tension or
compression?
2. What is the longitudinal strain in steel rod?
3. What is the modulus of elasticity of the material of the
rod?
4. What is the value of...

1) A 4" long key has a 0.5" wide by 0.75" high cross-section. if
the torque on the 2.4" diameter shaft is 1,200 in lb, the shear
stress on the key is?
2) A rigid coupling with 6 bolts 1/2" in diameter. the diameter
of the path circle of the bolts is 10" if the torque transmitted is
24,000 in lb the shear stress on the bolts is?
3) For a shaft that is transmitting 1,120.000 N.mm, while
turning 1,200...

Section 2: Supply and Demand Model and
PPF
This section deals with the Production Possibility Frontier and
market forces of supply and demand models, as well as, the impacts
of government policies on the interactions of supply and demand in
the market economy.
1. Given the table below, graph the demand and supply curves for
flashlights. Make certain to label the equilibrium price and
equilibrium quantity.
Price
Quantity Demanded Per Month
Quantity Supplied Per Month
$5
6,000
10,000
$4
8,000...

1. What physical quantity of the planet determines the depth of
the transit?
2. What 3 things can you use to determine the radius of the
exoplanet?
a) radius of the star, transit flux depth, the average flux b)
radius of the star, period, semi-major axis c) transit width
(duration), transit flux depth, period d) period, mass, the average
flux
3. What is the most common technique for detecting
exoplanets?
a) transit method b) radial velocity c) gravitational lensing d)...

the cross section of five long parallel wires, separated by a
distance d = 10 cm and have lengths of 21.0 m. Each wire carries a
current of 5.6 A. Currents 1, 3, and 5 are out of the page, while
currents 2 and 4 are into the page. Each wire experiences a
magnetic force due to the other wires. What is the magnitude and
direction of the net magnetic force on wire 1?

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