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On a cold winter day, the outside temperature is -5.0 °C while the interior of a well-insulated garage is maintained at 20.0 °C by an electric heater. Assume the walls have a total area of 75 m2, a thickness of 0.15 m, and a thermal conductivity of 0.042 W/(m · C°). What is the cost to heat the garage for six hours at these temperatures if the cost of electricity is $ 0.11/kWh?
Explain the physical phenomenon which causes the lower limit of the tunneling resistance of the source-QD and drain-QD junctions in a single electron transistor?
What is the cause of the internal resistance of a cell? Some batteries have low internal resistance and some others have high internal resistance
a car decelerates uniformly and comes to a stop after 10 s. the cars average velocity during deceleration was 50 kmh.
A sinusoidal current i= Icoswt has an rms value of I rms = 2.20 A. What is the current amplitude, What is the rectified average current
A small glass bead has been charged to + 30{rm nC} . a)What is the magnitude of the acceleration of a proton that is 3.0{rm cm} from the center of the bead? b)What is the magnitude of the acceleration of an electron that is 3.0{rm cm} from the cen..
A super tanker with the mass of 3.36 × 109 kg is moving with a constant velocity. Its engines generate a forward thrust of 4.11 × 105 N. Determine (a) magnitude of the resistive force exerted on the tanker by the water and (b) magnitude of the upward..
A tennis ball is hit with a speed of 27 m/s at an angle of 45o. It lands on the flat roof of a 13-m-tall building. What is its velocity at landing
A gas with ?=75 is at 285K when it's compressed isothermally to one-third of its original volume and then further compressed adiabatically to one-fifth of its original volume
Hail comes straight down at a mass rate of m/?t = 0.070 kg/s and an initial velocity of v0 = -13 m/s and strikes the roof perpendicularly. Unlike rain, hail usually does not come to rest after striking a surface. Instead, the hailstones bounce off..
A typical adult ear has a surface area of 1.49 × 10-3 m2. The sound intensity during a normal conversation is about 2.11 × 10-6 W/m2 at the listener's ear. How much power is intercepted by the ear
A power plant burns coal and generates anaverage of 650.0 Megawatts (MW) of electrical power whiledischarging 1001.00 MW as waste heat. Find the total electricalenergy generated by the plant in a 30-day period.
Two speakers produce a 288 Hertz sound in phase. If an intensity minimum is placed 2.85 meter from the nearer speaker, obtain the distance to the further speaker
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