Q.1 Differentiate between single crystal and polycrystalline. ( in details)

Three point charges are arranged along the xx axis. Charge q1q1q1 = -4.70 nCnC is located at x=x= 0.220 mm and charge q2q2q2 = 2.70 nCnC is at x=x= -0.350 mm . A positive point charge q3q3 is located at the origin.

a) What must the value of q3q3 be for the net force on this point charge to have magnitude 3.40 μNμN ?

b)What is the direction of the net force on q3q3?

c)Where along the x axis can q3q3 be placed and the net force on it be zero, other than the trivial answers of x=+∞x=+∞ and x=−∞x=−∞?

We talked about the Doppler Effect for sound waves. Electromagnetic waves exhibit the same type of effect. Explain in detail how Doppler shift is used in astronomy, weather forecasting and radar.

what is the implication of the third law of thermodynamics and the fate of the universe? (give evidence please)

Derive Lens equation of two convex lenses (L1 and L2) separated by 5 cm in Air. Write down the System Matrix equation and define each matrix elements.

On a frictionless horizontal air table, puck A (with mass 0.255 kg ) is moving toward puck B (with mass 0.375 kg ), which is initially at rest. After the collision, puck A has velocity 0.117 m/s to the left, and puck B has velocity 0.650 m/s to the right.

What was the speed vAi of puck A before the collision?

Calculate ΔK, the change in the total kinetic energy of the system that occurs during the collision.

A length of 20-gauge copper wire (of diameter 0.8118 mm) is formed into a circular loop with a radius of 24.0 cm. A magnetic field perpendicular to the plane of the loop increases from zero to 18.0 mT in 0.20 s. Find the average electrical power dissipated in the process.

What will the temperature of the cosmic microwave background be when the average distances between galaxies are 1.7 times as large as they are today? (Hint: The peak wavelength of photons in the background will then also be 1.7 times as large as it is today.)

Come up with a few collision situations where you think the forces the two carts exert on one another will be of equal magnitude. Briefly describe these situations.

Come up with a few collision situations where you think the forces the two carts exert on one another will be of different magnitude. Briefly describe these situations.

Come up with a few situations where one cart is pushing or pulling the other and you think the forces the two carts exert on one another will be of equal magnitude. Briefly describe these situations.

Come up with a few situations where one cart is pushing or pulling the other and you think the forces the two carts exert on one another will be of different magnitude. Briefly describe these situations.

Radius of Moon's orbit is 240000 miles and period of revolution is 27 days, diameter of Earth is 8000 miles and the value of gravity on its surface 32 ft/sec2. Verify the statement that the gravitational force varies inversely proportional to square of distance.

A mass is launched up a ramp so that the velocity of the mass at the bottom of the ramp is 11.0 m/s. The coefficient of friction between the ramp and the mass is 0.27, and the ramp angle is 41 degrees. How far up the ramp will the mass slide?

Please try to explain how you get your answer.

You’re the infamous captain of a roving band of pirates and you recently captured a castle

full of treasures. Another band of marauding pirates are trying to storm your castle. You have

a single cannon that can fire cannon balls from over the castle walls and down to the ground

below. In order to successfully hit the pirates on the ground, you need to know the

typical

launch speed of cannon ball fired from your cannon.

To determine the launch speed of the cannon ball, you fire a cannon ball and observe that the

ball hits a target

R

meters away as measured from the base of castle’s wall. The cannon ball

is fired horizontally at a height of

h

meters above the ground. Using these data, determine the

cannon ball’s time of flight

t

and its launch speed

v

0

. Your answer for time of flight should be

expressed in terms of

h

and

g

and your answer for launch speed should be expressed in

h

,

g

,

and

R

only.

A long coaxial cable with a radius s carries a uniform line charge Q on its inner conductor and a uniform surface charge -Q on its outer conductor.

a) Sketch the situation including the electric field E inside and outside the cable.

b) Find the electric field inside and outside the cable.

c) Plot |E| as a function of the radius s.