Two converging lenses

(f₁ = 9.40 cm

and

f₂ = 5.50 cm)

are separated by 17.9 cm. The lens on the left has the longer focal length. An object stands 12.4 cm to the left of the left-hand lens in the combination. Locate the final image relative to the lens on the right. Obtain the overall magnification. Is the final image real or virtual? With respect to the original object, is the final image upright or inverted and is it larger or smaller?

(a) Locate the final image relative to the lens on the right.
cm  ---Select--- to the right of the right-hand lens to the left of the right-hand lens

(b) Obtain the overall magnification.


(c) Is the final image real or virtual?

realvirtual    

(d) Is the final image upright or inverted?

uprightinverted    

(e) Is it larger or smaller?

largersmaller   

(about solid state physics, optical communication)
The main principle of optical communication is the concept of total reflection. I wonder if the total reflection is based on particle property of light, or wave property of it.

The total reflection is the concept of refraction and reflection. I know that refraction and reflection of light are all properties that correspond to the particle and wave of light.(I mean, Particle property of light can explain refraction and reflection, and Wave property of light too.)
So.. Is it right if total reflection is using(based on) both particle and wave properties of light???

(c) Discuss the Minkowski spacetime diagrams. Show the world lines for a particle at rest and a photon on such a diagram. Explain the concept of light cones and draw it on your diagram.

a tire is filled with air at 14 ∘c to a gauge pressure of 230 kpa

If the tire reaches a temperature of 35 ∘C∘C, what fraction of the original air must be removed if the original pressure of 230 kPakPa is to be maintained?

A mass of 3 kg of water at 50oC has been heated to vapour at a temperature of 125oC in an oven. The specific heat capacities for water in the form of liquid (Cw), solid (Cice) and gas (Cv) are 4.187 kJ.kg-1.K-1, 2.108 kJ.kg-1.K-1, and 1.996 kJ.kg-1.K-1, respectively. Also, latent heats of fusion and vaporization are given as 3.33 x 105 J.kg-1 and 2.22 x 103 J.kg-1, respectively. NB: Number your answers correctly!

(a) What would be the entropy of water in the form of liquid, SL? (5)

(b) Calculate the entropy of the system when it changes its state/phase to vapour, Sv. (3)

(c) Compute the total entropy, STotal, of water between 50 oC and 125 oC. (5)

1.For an angle of zero between the magnetic field and the vector normal to the plane of the coil: (a) What happens to the light bulb as it enters the magnetic field region? Explain. (b) What happens to the light bulb as it moves while it is completely inside the magnetic field? Explain. (c) What happens to the light bulb as it exits the magnetic field region? NOTE: Use Faraday’s Law to explain.

2.For an angle of zero between the magnetic field and the vector normal to the plane of the coil: What happens to the light bulb when the you flip the direction of the magnetic field? Explain using Faraday’s Law.

3.For an angle of zero between the magnetic field and the vector normal to the plane of the coil: What happens to the light bulb when the magnitude of the magnetic field varies? Explain using Faraday’s Law

4.For an angle of zero between the magnetic field and the vector normal to the plane of the coil: What happens to the light bulb when the coil moves vertically? Explain using Faraday’s Law

fred places two circular loops of conducting wire, one large (radius R) and one small (radius r),
on a horizontal table such that they are centred at the same point. He arranges the larger loop
to carry a constant current I clockwise (when viewed from above). In order to induce a current
in the smaller loop, fred then lifts the smaller loop vertically upwards at a constant speed v,
without changing its orientation.
1 - Explain why fred is correct to expect an induced current in the smaller loop, and determine which way this current will flow.
2 - Show that the emf induced in the small loop is approximately
E = (U_03IR^2v/2z^4)*PIr^2
where z is the height above the table. You may use the result that the magnetic field
along the z-axis produced by the large loop is B = µ_0IR^2/2z^3. Make sure to explain,
with the aid of a diagram, the simplifying assumptions you need to make.
3 - Meanwhile sam, who is also in the room, happens to be levitating upwards at the same
velocity as the small loop. Thus the small loop is stationary in her frame. Explain,
from sam’s point of view, why she should also expect to see an induced emf in the small
loop. Your explanation should comment on the differences between fred’s and sam’s
description of the cause of the emf and explain how it is that they can both be correct.

Compare and contrast the four-planet detection techniques described during lectures. Use labelled diagrams and equations relevant to each technique to illustrate and support your statements. The methods are: Transit detection, Radial velocity method, direct imaging and microlensing

1. A toy car of mass 2.0 kg moving to the right with a speed of 8.0 m/s collides perfectly inelastically with another toy car of mass 3.0 kg that is moving to the left with a speed of 2.0 m/s. Find the magnitude and the direction of the velocity of the system Immediately after the collision.

2. In an elastic collision of two objects,

a. momentum is not conserved.

b. momentum is conserved, and the kinetic energy after the collision is less than its value before the collision.

c. momentum is conserved, and the kinetic energy after the collision is the same as the kinetic energy before the collision

d. the kinetic energy of the system after the collision depends on the masses of the objects

3. Object 1 has more kinetic energy than Object 2. How do the magnitudes of their momenta compare?

a. P1=P2

b. P1>P2

c. p1 ≥ p2

d. not enough information given to tell

4. Explain the processes of lasing in the Co2 laser. What is the function of Nitrogen, and Helium in the gas mixture of the co2 laser?

(a) Compute the first-order correction to all energy eigenvalues of a particle in a square well in the region 0 ≤ ? ≤ L with added potential: ?(?) = ?_o? when 0 ≤ ? ≤ L/2 and ?_o (L − ?) when L/2 ≤ ? ≤ L.

(b) Using the given potential, use the variational theorem to compute an upper bound to the ground state using the trial function below

∅(?) = ?₁ (2/L)^1/2 sin ( ??/L ) + ?₂ (2/L)^1/2 sin ( 2??/L )

A sphere with radius a = 8 cm is in a conductive sphere shell with an internal radius of b = 12 cm and an outer radius of c = 18 cm with a load of -200 mC.
a) Determine the load distribution in the sphere and sphere shell.
b) Calculate the value of the electric field in r = 0 cm, r = 4 cm, r = 8 cm, r = 10 cm, r = 14 cm, r = 18 cm and r = 50 cm, and plot the electric field with respect to r.

A 2500-kg rocket blasts off from Planet A headed directly towards Planet B. The masses of Planet A and B are 6x1024 kg and 3x1025 kg respectively and the distance between the planets is 4x108 m. How far from Planet A will the rocket have traveled when the net gravitational force on the rocket from the two planets is zero?

For Astronomy class, please answer this question clearly, thank you.

Describe the similarities and the differences between the mechanisms by which Terrestrial and Jovian planets generate their magnetic fields.