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A 15hp 220V 2000rpm separately excited dc motor controls a load requiring a torque ofτL=45N·mat a speed of 1200rpm. The field circuit resistance isRf = 147?, the armature circuit resistance isRa=0.25?, and the voltage constant of the motor isKv=0.7032V/A-rad/s. The field voltage is Vf = 220V. The viscous friction and no-load losses are negligible. The armature current may be assumed continuous and ripple free. Determine the back emf, Ea;
Light from a hydrogen discharge passes through a diffraction grating and registers on a detector 1.5 m behind the grating. find the position of the second member of the Paschen series
a wire 50.0 cm long and under tension 400n is placed near a louderspeaker fed by an audio oscillator of variable
Two identical guitar strings are prepared such that they have the same length (2.04 m) and are under the same amount of tension. What is the wave propagation speed on the guitar strings
a meterstick is moving by an observer in a direction parallel to its length. the speed of the meterstick is .49c. what
On a workday, the average decibel level of a busy street is79dB with 100 cars passing a given point every minute. what is the decibel level of the street
A 50-g block of an unknown material is at 530°C. It is dropped into a thermally insulated cup containing 0.07L of water at 20°C. If the temperature of the compound rises to 50°C, what is the specific heat of the unknown material?
q1. an open-pit coal mine consumes 96 hectares of land down to the depth of 26 m each year. what volume of earth in
You have a 210-? resistor and a 0.360-H inductor. Suppose you take the resistor and inductor and make a series circuit with a voltage source that has a voltage amplitude of 30.0V, What is the voltage amplitude across the inductor
A 460 W heating unit is designed to operate with an applied potential difference of 116 V. By what percentage will its heat output drop if the applied potential difference drops to 112 V
Three point charges, A = 1.60 µC, B = 6.90 µC, and C = -3.90 µC, are located at the corners of an equilateral triangle as in the figure above. Find the magnitude and direction of the electric field at the position of the 1.60 µC charge.
A spring has a force constant (k=18N/m). If it's compressed 50 centimeter from its original equilibrium length, determine how much mass will have gained
You are on an airplane traveling 30° south of due west at 180.0 m/s with respect to the air. What is the heading of the plane with respect to the ground
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