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A heat engine operates among 40°C and 380°C. Being a real engine, its efficiency is only 60 percent of that theoretically possible for a Carnot engine at these temperatures. If it absorbs heat at a rate of 60 kW, at what rate does it exhaust heat?
A light beam is traveling through an unknown substance. When it exits that substance and goes into air, What is the index of refraction of the substance
A Carnot engine operates between the temperatures 420 K and 300 K. How much heat must be given to the engine to produce 2500 J of work
A current-carrying wire of length 0.5m is at the Equator. Assuming that the magnetic field of the Earth has magnitude of 5 x 10^-5 T, what current is required to allow the wire to be suspended
You just calibrated a constant volume gas thermometer. What is the temperature of the thermometer, when it reads a pressure of 480 kPa
The band gap of the semiconductor gallium arsenide (GaAs) is 1.43 eV , and the bandgap for the semicondcutor aluminum gallium arsenide (AlGaAs) is 2.06 eV. find the maximum wavelength absorbed by GaAs
An artificial satellite circling the Earth completes each orbit in115minutes. (The radius of the Earth is6.38106m. What is the value ofgat the location of this satellite
A flashlight bulb operating at a voltage of 5.9 V has a resistance of 6 O. How many electrons pass through the bulb filament per second
Male mosquitoes in the mood for mating find female mosquitoes of their own species by listening for the characteristic "buzzing" frequency of the female's wing beats. How many wing beats occur in one minute
How much greater is an angular momentum of the Earth orbiting about the sun than the moon orbiting about the Earth? (Set up a ratio of angular momenta using data on inside back cover. The period of the moon is about 27.3 days.)
question1a ball of mass 10 kg and a ball of mass 1000 kg are ?oating in empty space connected by a spring of negligible
What is the wavelength of the electromagnetic waves used for cell phone communications in the 900-MHz band?
A spring is hanging from the ceiling. Attaching a 560 g mass to the spring causes it to stretch 22.0 cm in order to come to equilibrium. At what position or positions does it have this speed
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