A portable radio is sitting at the edge of a balcony 5.1 m above the ground. The unit is emitting sound uniformly in all directions. By accident, it falls from rest off the balcony and continues to play on the way down. A gardener is working in a flower bed directly below the falling unit. From the instant the unit begins to fall, how much time is required for the sound intensity level heard by the gardener to increase by 10.0 dB?

A transformer is intended to decrease the value of the alternating voltage from 500 volts to 25 volts. The primary coil contains 200 turns. Find the necessary number of turns N2 in the secondary coil.

A transformer is intended to decrease the value of the alternating current from 500 amperes to 25 amperes. The primary coil contains 200 turns. Find the necessary number of turns N2 in the secondary coil.

In a transformer, the primary coil contains 400 turns, and the secondary coil contains 80 turns. If the primary current is 2.5 amperes, what is the secondary current I2?

A transformer supplies 60 watts of power to a device that is rated at 20 volts. The primary coil is connected to a 120-volt ac source. What is the current I1 in the primary coil?

The voltage and the current in the primary coil of a nonideal transformer are 120 volts and 2.0 amperes. The voltage and the current in the secondary coil are 19.4 volts and 11.8 amperes. What is the efficiency e of the transformer? The efficiency of a transformer is defined as the ratio of the output power to the input power, expressed as a percentage: e=100Pout/Pin.

A copper wire has a diameter of 3.247 mm. What magnitude of current flows when the drift velocity is 4.40 mm/s? Take the density of copper to be 8.92 g/cm3. Give your answer in Amperes.

PLEASE PLEASE PLEASE answer correctly

Givens:

Altitude: FL310 (31,000 ft Pressure Altitude)

Indicated Airspeed: 250 KIAS

Indicated Outside Air Temperature (IOAT) or Total Temperature: -30 deg C

Figure 2.1 for Atmosphere

Figure 3.1 Position Errors

Figure 3.2 Compressibility Errors

Figure 11.2 or Tt = Ta (1 + .2M2) Temperature Ram Rise

1. Find CAS (Calibrated Airspeed in kts).

2. Find EAS (Equivalent Airspeed in kts).

3. Find Pressure Ratio: .

4. Find Mach.

5. Find Actual Outside Air Temperature (ambient temperature).

6. Find Temperature Ram Rise.

7. Find Density Ratio: .

8. Find TAS, True Airspeed in kts.

9. If you are landing into an airfield in mountainous terrain at a field elevation of 3,000 ft

MSL (Mean Sea Level) and the field outside air temperature is -24 deg C, according to

AC 91-XX Draft Appendix 2, how should you adjust your approach arrival procedures

with a Final Approach Fix (FAF) at 5,000 ft MSL and your Minimum Descent Altitude

(MDA) at 3500 ft MSL?

Four point masses are arranged as follows: m1 = 5.76 g at (0,19.6 cm), m2 = 2.25 g at (19.6, 0) cm, m3 = m1 at (0,-19.6) cm and m4 = m2/.49 at (-19.6, 0) cm. These are all immovable

a) In unit vector notation, what is the net gravitational force from them on a point with mass m5 = 2.56 g at the origin?

b) If m5 was free to move and released from rest what will its speed be after travelling 9.8 cm?

c) Imagine a new configuration where m2 has been removed. What would then be the new answer to part b?

An insulated wall consists of an exterior wood layer of thickness 3.1 cm and an interior layer of foam insulation of thickness 2.3 cm . For the wood, k=0.080W/(m⋅K), and for the foam insulation k= 0.010 W/(m⋅K). The outer surface of the wood is at a constant -15.0 ∘C , and the inner surface of the foam insulation is at a constant 19.0 ∘C .

Calculate the temperature in Celsius where the wood and foam insulation are in contact. T=???

Calculate the heat flow per unit area through the two-layer wall. H=?? W/m^2

When t = 0, the position of a point is s= 6m, and its velocity is v= 2m/s. From t = 0 to t= 6s, the acceleration of the point is a = 2+ 2t² m/s² .From t = 6s until it comes to rest, its acceleration is a = -4m/s²

^{a.) What is the total time of travel?}

^{b.) What total distance does the point move?}

A uniform cubical crate is 0.575 m on each side and weighs 900 N. It rests on the floor with one edge against a very small, fixed obstruction. At what height above the floor must a horizontal force of 625.0 N be applied to the crate to just tip it?

Two rectangular pieces of plane glass are laid one upon the other on a table. A thin strip of paper is placed between them at one edge, so that a very thin wedge of air is formed. The plates are illuminated at normal incidence by 542nm light from a mercury-vapor lamp. Interference fringes are formed, with 14.0fringes/centimeter .

Find the angle of the wedge.

A spacecraft with a proper length of 350 m passes by an observer on the Earth. According to this observer, it takes 0.780 µs for the spacecraft to pass a fixed point. Determine the speed of the spacecraft as measured by the Earth-based observer.

Please show how you arrive at your answer!

Explain the following natural events in terms of the laws of physics that you have learned in this class. Include figures if necessary. Answer any two.

How does a bird fly?

If you keep boiled egg inside refrigerator, it becomes difficult to take the shell off. But if you keep it warm water for a minute or so it becomes very easy. Why?

Why inside swimming pool we feel very light weight?

Mention all the laws of physics applied in these processes.

Explain the following natural events in terms of the laws of physics that you have learned in this class. Include figures if necessary. Answer any two.

How does a bird fly?

If you keep boiled egg inside refrigerator, it becomes difficult to take the shell off. But if you keep it warm water for a minute or so it becomes very easy. Why?

Why inside swimming pool we feel very light weight?

Mention all the laws of physics applied in these processes.

(a) Using Kirchhoff’s laws, derive an equation for the voltages, V1 and V2, across two resistors, R1 and R2, in series connected to a voltage supply V .

(b) Using Kirchhoff’s laws, derive an equation for the voltages across two resistors R1 and R2 in parallel connected to a voltage supply V .

1- relate characteristics of semiconductor basic mechanism of electrical conduction

2- determine important parameters of semiconductor

3- describe operation principle of semiconductor devices

4- demonstrate the understanding of intrinsic-extrinsic semiconductor characteristic`.