Q.Explain the following

(a) Solar photo voltaic system.

(b) Solar thermal energy technologies.

A series circuit consists of an ac source of variable frequency, a 110 ? resistor, a 1.20 ?F capacitor, and a 4.10 mH inductor.

A.) Find the impedance of this circuit when the angular frequency of the ac source is adjusted to the resonance angular frequency.

B.) Find the impedance of this circuit when the angular frequency of the ac source is adjusted to twice the resonance angular frequency.

C.) Find the impedance of this circuit when the angular frequency of the ac source is adjusted to half the resonance angular frequency.

Suppose a child gets off a rotating merry-go-round. Does the angular velocity of the merry-go-round increase, decrease, or remain the same if:

(a) He jumps off radially?

(b) He jumps backward to land motionless?

(c) He jumps straight up and hangs onto an overhead tree branch?

(d) He jumps off forward, tangential to the edge?

1. Two students in a physics laboratory each have a concave mirror with the same radius of curvature, 52.0 cm. Each student places an object in front of a mirror. The image in both mirrors is two and a half times the size of the object. However, when the students compare notes, they find that the object distances are not the same. What is the distance of the farther object in cm?

I got 27.027 but that is incorrect

2. An object placed 27.0 cm in front of a convex mirror produces an image that is one-half the size of the object. What is the focal length of the mirror in cm ?(include the proper algebraic sign to reflect the nature of the mirror)

I got 34.01 but that is incorrect

In the figure, the particles have charges q1 = -q2 = 390 nC and q3 = -q4 = 95 nC, and distance a = 5.0 cm. What are the (a) x and (b) y components of the net electrostatic force on particle 3?

A proton moving horizontally at a speed of 2.88x10^5 m/s enters a region of space between two

square metal plates of side length 8.77 mm. The proton's path is deflected an angle of 12º upward. Protons have a mass of 1.67x10^-27 kg.

a) Determine the electric field between the plates.

b)Determine the amount and sign of electric charge on each plate.

The rate at which a nebular cloud rotates increases as the cloud collapses to form systems of stars and planets. Consider a small segment of a nebular cloud with a mass ? of 1.9×1027 kg, tangential velocity ?initial equal to 6.8 km s−1 located at an orbital distance ?initial=2.5×104 km. After the cloud collapses, the same small segment is located at an orbital distance ?final=3.2×103 km. Calculate the change of the rotational velocity, Δ?, for the cloud segment, assuming perfectly circular orbits. Perform your work and report your solution using two significant figures.

What changes in the atomic structure cause the absorption and emission of photons (light)?

i) Absorption

ii) Emission

Please solve and explain all parts. I don't understand

You decide to play a trick on your friend by dropping a raw egg onto their head

The egg is dropped (no initial velocity) from a height of 15 meters. Your goal is to have the y position of the egg exactly match the height of your friend at the same moment he steps onto the red x you painted on the ground (not suspicious at all). Your friend has a height of 66.929 inches and is walking toward the building at a constant speed of 4.429 feet/second.

-Convert your friend's height into proper units. h = meters

-Convert your friend's speed into proper units. v_friend = meters/second

-Determine the time at which the egg's y-location equals your friends height. t(y_egg=h) = seconds

-Determine the starting position of your friend at the time you dropped the egg (enter a positive number). d = meters

Please solve and explain all parts

Many people assume that it is impossible for a car to turn in the absence of friction. If the roadway is banked at exactly the right angle, a car at exactly the right velocity will be put into uniform circular motion and execute the turn successfully.

Here the department of transportation has constructed a roadway that will cause your car to turn in a circle of radius R = 175.00 meters. The roadway itself is banked with an angle of θ = 20.0 degrees. Assume that your car has a mass of m = 950 kg.

Calculate all the following:

The normal force of the road on your car, N

The velocity of your car, v m/s

The time required to make a 90 degree turn, s

A 2750 lb car has a frontal cross-sectional area A of 22.4 ft², a drag coefficient C_d of 0.28, and a drive (or tractive) force of 280 lbs. Assume an air density of 2.3x10^-3 slug/ft^3.

^A.  Determine the acceleration of the car when it is driving at 31 mph on a level road.

B.  Determine the acceleration of the car when it is driving at 31 mph on a level road into a 7 mph head wind.

C.  Determine the acceleration of the car when it is driving at 31 mph up a 2.1 degree hill (no head or tail wind).

An ant, crazed by the Sun on a hot Texas afternoon, darts over an xy plane scratched in the dirt. The x and y components of four consecutive darts are the following, all in centimeters: (30.0, 38.0), (bx, -68.0), (-23.0, cy), (-83.0, -68.0).The overall displacement of the four darts has the xy components (-140, -19.0).What are (a) bx and (b) cy? What are the (c) magnitude and (d) angle (counterclockwise from the positive direction of the x axis) of the overall displacement?