Phys1_06-Conservation_Laws_defb967a-9344-49c1-bde6-034991d433e7

3.12 A carbon brush used to conduct current from the commutator of a DC generator has a length of 4 in. It must conduct a current of 400 A with a voltage drop not exceeding 2 V. Determine the cross-sectional area of this carbon brush. 3.13 Early DC machines use brass brushes instead of carbon brushes. The com- mutator bars do not last very long since brass is a rather hard metal. If a brass brush of the dimensions determined in problem 3.12 is used instead to conduct the same current, determine the voltage drop.

A diaphragm pressure cell which has an input of a change in the pressure difference between its two sides, the outputform is:Select one: a. Currentb. Capacitance c. VoltageO d. Magnetic fieldO e. ResistanceO f. DisplacementO g. Heat

what is the B and the m variable in the repulsive force rule and how did we get it from coloumb's law i think?

1) a) Describe the vector potential. b) Explain the revised part of the Ampere's Law c) Show the analogy between microscopic and macroscopic Ohm's Law. d) Explain the gauge condition(transformation) e) Describe the difference between conductive current and displacement current. f) Show and explain the contuniuty and conservation of charges

P KN Refer to the figure. d₁ 0.9 m Force P is 60 kN and each force Q is 125 kN. Q KN Add your answer Integer, decimal, or E notation allowed Q KN The diameter d₁ = 30 mm and diameter d₂ = 50 mm. B d₂ 1.2 m What is the normal stress in rod AB in MPa? Round to the nearest integer and enter the magnitude only. C Gi

There are 6 equations that govern electromagnetism. Write them out in CGS and differential form (except for one in integral form). Assume the magnetostatic case.

H.W Q1: In your own words, explain how the galvanometer works? Q2: In your own words, what are the cases of dynamic behavior of PMMC?

A two ends of an electromotive force source were connected with an external resistance its value is (5 2), and with an Ammeter device shown in the figure. So, if you know that the electromotive force of the source is (24 V), and its internal resistance is (3 2). Calculate: a/ The reading recorded by the Ammeter device? b/ The voltage difference between the two terminals of the external resistance? c/ The time rate of energy (power) supplied by the source to the circuit? d/ The time rate of energy (power) dissipated inside the source? e/ The time rate of thermal energy (thermal power) generated by the external resistance?

Figure (1) shows a vibrating mechanical system. When applied to the system a force of 2 N (step input), the mass oscillates as shown in Figure (2).Determine m, b, and k of the system from this response curve. The displacement x is measured from the equilibrium position.

. To stretch a spring 3.00 cm from its unstretched length, 12.0 J of work must be done. (a) What is the force constant of this spring? (b) What magnitude force is needed to stretch the spring 3.00 cm from its unstretched length? (c) How much work must be done to compress this spring 4.00 cm from its unstretched length, and what force is needed to compress it this distance?

Propose a mathematical model for the rotational mechanical system in Figure 1 using the force-voltage analogy d²q dg + R dt *T9 = (t) 1 e, T(t) K B1 do + B + KO = T (t) dt2 dt Figure 1 a) Propose a mathematical model for the translational mechanical system of the figure using the force-voltage analogy. b) Draw the electric circuit. c) Propose a mathematical model for the electric system. d) Change the electric model to obtain the equivalent mechanical system.

What is Lenz's law and derive its formula.

4- Can value of the string efficiency being equal to 100%. Explain your answer.5- Outline methods used to equalize the potential across the units.6- Why an insulator is represented as a capacitor C? What are the assumptionmodes?

A particle is subject to a force Fy that varies with position (x) as shown in the figure below. The work done on the particle as it moves from x = 0 m to x = 4 m is %3D (N) x (m) 10 12 O a. 24 J O b. 16 J O c. 8J O d. 32 J

In the Coulomb force expression for the point particles, F=k, 9192 23- ,what is the SI unit of k. ? kg' m O A) 5-C kg m B) sC kg-m kg-m? D) 5c kg*-m? E) 5C

What causes transients? Select one or more: a. Energy is stored into capacitance and inductance b. Power required for transporting energy can be infinite c. The power required for transporting energy cannot be infinite Od. Energy is stored into resistance and capacitance e. Energy is stored into resistance, capacitance and inductance

A P KN Refer to the figure. d₁ 0.9 m Force P is 60 kN and each force Q is 125 kN. Q KN B Add your answer Integer, decimal, or E notation allowed Q KN The diameter d₁ = 30 mm and diameter d₂ = 50 mm. d₂ 1.2 m What is the normal stress in rod BC in MPa? Round to the nearest integer and enter the magnitude only. C

2. A charge will experience a force in an electric field when it is: .............a. Stationaryb. Movingc. Stationary Or movingd. None of above3. The algebraic sum of voltages around any closed path in a network is equal to ..........a. Infinityb. 1c. 0d. Negative polarity4. A junction connects two (or) more than two network elements meet known as a ..........a. Nodeb. Branchc. Loopd. Mesh Final Research Project 7 | P a g e5. With Ohm's law, if voltage increases and resistance stays the same:..................a. current remains the sameb. power decreasesc. current increasesd. resistance decreases6. In superconductivity the conductivity of a material becomes .....................a. Zerob. Finitec. Infinited. None of the above7. If a negative charge move to a positive

Q5) prove that for any adiabatic process (pv' = c) the work done is: W= (P1v1 - P2V2)/(1-)

Wind mill with 2 m diameter works on the principle of converting kinetic energy of the wind in to mechanical energy. If air density = 1.225 Kg. / m°wind speed 20 m/sec then power available from wind mill is 30787.6 w 30787.1 w 30787.3 w

For the circuit shown in Figure:a. Determine the reluctance values and show themagnetic circuit, assuming that μ = 3,000μ0.b. Determine the inductance of the device.c. The inductance of the device can be modified bycutting an air gap in the magnetic structure. If a gapof 0.1 mm is cut in the arm of length l3, what is thenew value of inductance?d. As the gap is increased in size (length), what is thelimiting value of inductance? Neglect leakage fluxand fringing effects.

Q4/ Using three different ways, compute the the moment of the force 400 N about O? 400 N k100 mm 60° 120 mm 60 mm

16 If permittivity E is independent of the magnitude of E, then the material is said to be because D andE are related linearly, and if it is independent of the direction of E, the material is said to be non linear, linear linear, isotropic isotropic, linear conservative, linear isotrpic, ideal

What is the difference between performance and potential?

A force of magnitude 6 units acting parallel to 2î -2f +k, displaces the point of application from (1,2,3) to (5,3,7). Find the work done.

In the figure below, the rolling axle, 2.90 m long, is pushed along horizontal rails at a constant speed v = 12.00 m/s. A resistor R = 0.4000 N is connected to the rails at points a and b, directly opposite each other. The wheels make good electrical contact with the rails, so the axle, rails, and R form a closed-loop circuit. The only significant resistance in the circuit is R. A uniform magnetic field B = 0.0300 T is vertically downward. B b. (a) Find the induced current I in the resistor. A (b) What horizontal force F is required to keep the axle rolling at constant speed? N (c) Which end of the resistor, a or b, is at the higher electric potential? O Point a is at a higher potential. Point b is at a higher potential. O Point a and point b are at equal potentials. (d) After the axle rolls past the resistor, does the current in R reverse direction? O Yes No

Problem 1 A force sensor is built as a capacitor with one plate fixed while the other can move against a spring with constant k [N/m). By pressing on the movable plate, the distance the plate moves is directly proportional to the force. The plates have an area S and are separated by a distance d. Using Figure P1, and assuming the plate has moved a distance x from the rest position: a) Find the relation between measured force and the capacitance of the sensor. b) How can this device be used to measure pressure? Calculate the relation between pressure and capacitance. c) How can this device be used to measure acceleration? Calculate the relation between acceleration and capacitance. Assume that the mass of each plate is m [kg] and the mass of the spring is negligible. F Moving plate Spring Fixed plate Figure P1

6. Why is it important to measure Strain? 7. What is your own understanding of Young's Modulus? 8. What is the major difference between stress and strain? 9. What is the mathematical relationship between voltage and strain based on your data? 10. What is the mathematical relationship between voltage and stress based on your data?

Which is NOT a property of an ideal gas? A) Consists of point particles B) Can pass through walls C) There are no attractive/repulsive forces D) All of the above are properties of ideal gases E) None of the above are properties of ideal gases

B2. Determine the resistance of an aluminium coil of 1.4 cm as diameter consists of 15600 turns and the mean length per turn is 43 cm. Take the electrical resistivity aluminium coil as 0.018 μ0-m. The area in cm² is The total length in m is The resistance of the coil in 2 is

Identify the transformation of energy in a hydroeclectric power plant. A. Potential > Kinetic > Mechanical > Electrical B. Mechanical > Kinetic > Potential > Electrical C. Potential > Mechanical > Kinetic > Electrical D. Kinetic > Mechanical > Potential > Electrical