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A coil spring has a spring constant of 5 lb/in. and a rest length of 3 in. In a machine, the spring is stretched to 4.5 in. and is used to exert a constant force on a lever. How much force does the spring exert?
The duration of a cellular call is an exponential random variable with expected value of 3 minutes. A subscriber makes 120 calls each month. Use the central limit theorem to estimate the probability that the subscriber uses at least 400 minutes.
CDMA is a multiple access technique to allow multiple users to share the same bandwidth, based on the orthogonality of their spreading codes. CDMA is a descendent of the direct sequence spread spectrum (DSSS) technology designed for antijam (AJ).
If the semiconductor depicted in the graph below is germanium at room temperature, what is the value of n (the density of electrons in the conduction band) at x=L
A magnetic material fills the half-space z 0) is free space. The per-meability of free space is mu_0 and the permeability of the magnetic material is 5 mu_0. The magnetic flux density in the magnetic material is B2= 10 ax+ 15 ay-20 az
The noise temperature at the receiver antenna terminals is T0=290K. The equipment and environment suggest that 6dB of margin be used to assure performance under all conditions. For reliable voice communications, a received signal should be 17dB ab..
A 4.5-volt series circuit consists of two resistors. Resistor A has three times the resistance as resistor B. An ammeter records a current of 160 mA of current. Determine the resistance values of resistors A and B.
Construct the routing table of router R3 for this configuration
The prime mover rotates the armature at a speed of 1000 rpm. Determine the no-load voltage, the full-load voltage, and the torque required by the prime mover at full load if the full-load power required by the load is 3 kW
A 3 phase Y connected alternator is rated at 1600 KVA, 13500 V. The armature resistance and synchronous reactance are 1.5 ohms and 30 ohms respectively. Calculate the % voltage regulation for a load of 1280 KW at 0.8 leading power factor.
A 10-mV signal source having an internal resistance of 200 kO is connected to an amplifier for which the input resistance is 20 kO, the open-circuit voltage gain is 2000 V/V, and the output resistance is 1 kO. The amplifier is connected in turn t..
A 10kVA, 200/400V 50Hz single-phase transformer gave the following test results. O/C test: 200V, 1.3A, 120W, on l.v. side. S/C test: 22V, 30A, 200W on h.v. side. (a) Calculate the magnetizing current and the component corresponding to core loss at ..
An object in a microwave oven 25 cm in diameter and 4 cm thick is being warmed. Determine how deeply the signal penetrates if the objects εr is 12.5 and σ is 2 S/m at a frequency of 2.5 GHz. Assume that the plane wave calculations are valid.
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