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1) a) I placed several aluminum pie plates on top of the large metal sphere of the van de Graaff machine and then turned it on. After a few seconds the pie plates flew off. Explain why. Focus on physics involved.
b) When I placed packing peanuts in a pie plate they also flew off. Why? Can this be explained by the same physical mechanism as question a)? Explain.
c) A second smaller metal sphere was positioned nearby the van de Graaff machine. This sphere was grounded. Did this small sphere become charged? How and why? What was the interaction between the two spheres (attractive or repulsive)? Explain.
The addition of a 20-kvar capacitor bank improved the power factor of a certain load to 0.90 lagging. Determine the complex power before the addition of the capacitors, if the final apparent power is 185 kVA.
You are designing a general purpose integrated circuit oscillator that will operate at various frequencies, based on the external reactances the user supplies. You expect that the IC will be used as a fixed frequency oscillator in portable equipm..
A semiconductor company has the following costs associated with Product X: - Fixed cost of $1B ($1,000,000,000) - Die cost of $6 at a die yield of 50% - Testing and packaging cost of $3 per die - A final test yield of 90% with a product volume of 500..
Problem Feeder - Transformer, A single-phase load is supplied through a 35 kV feeder whose impedance is 115 + j380 Ohms and a 35 kV, 2400 V transformer whose equivalent impedance is 0.26 + j1.21 Ohms referred to its low voltage side.
You have a bandwidth of 10 MHz (per direction) in a single-cell system and want to deploy a wireless telephone system. You have the following options: analog 30-kHz channels (as in AMPS)
The transfer function contain two complex conjogate
A separately excited DC motor runs at1500 rpm under no load with 200 V applied to the armature.The field voltage is maintain at its rated value. The speed of the motor, when it delivers a torque of 5 Nm ,is 1400 rpm.
Calculate the intensity transmission coefficient T1 for the following interfaces, assuming that the ultrasound beam is exactly perpendicular to the interface: muscle/kidney, air/muscle, and bone/muscle.
A volume is divided into two equal parts by a partition. The left volume has N atoms. The atoms have a mass m. A hole of area A is made in the partition at time t=0 A)Develop an expression for the number of white atoms on each side of the partition..
A parallel RLC network is constructed with a 5 mH inductor, and the remaining component values are chosen such that Q0 = 6.5 and ω0 = 1000 rad/s. Determine the approximate value of the input impedance magnitude for operation
When a forward bias is applied across a junction is the increased current flow due to movement of the Fermi level closer to the band edge or to lowering of the potential barrier. If you want to increase the space charge width on the n side of a p,n..
Compute the power levels of the 2nd, 3rd, and 4th harmonics relative to the fundamental output signal for the Class C amplifier. compute the Fourier coefficients for the harmonics of the clipped sinusoid that results from the partial conduction an..
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