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The attractive electrostatic force between the point charges +8.37 x 10-6 C and Q has a magnitude of 0.966 N when the separation between the charges is 0.60 m. Find the sign and magnitude of the charge Q.
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the orbital period of the faster planet, in years
An engine is built to extract power from the temperature difference in the ocean. what is the maximum theoretical efficiency of such an engine
110 grams of boiling water (temperature 100° C, heat capacity 4.20 J/gram/K) are poured into an aluminum pan whose mass is 1000 grams and initial temperature 24° C (the heat capacity of aluminum is 0.9 J/gram/K).
An engine absorbs 1.68 kJ from a hot reservoir at 277°C and expels 1.23 kJ to a cold reservoir at 27°C in each cycle. How much work is done by the engine in each cycle
A diathermy machine, used in physiotherapy, generateselectromagnetic radiation that gives the effect of "deep heat" whenabsorbed in tissue. What is the wavelength of this radiation
A defibrillator is used during a heart attack to restore the heart to its normal beating pattern. How much charge moves during this time
25.00kg lead sphere is hanging from a hook by a thin wire 3.50m long, and is free to swing in a complete circle. What must be the minimum initial speed of the dart
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1380 Hz. What is the speed of the bird
An astronomical telescope uses an objective power of +1.280 D. If the length of the telescope is 80.000 cm, what are power of the eyepiece
The nucleus of an atom consists of protons and neutrons (no electrons). A nucleus of a carbon-12 isotope contains six protons and six neutrons.
A square wire loop 11.0 cm on each side carries a clockwise current of 16.0 A. Find the direction of this magnetic field
Two 22.3-cm-focal-length converging lenses are placed 16.5?cm apart. An object is placed 35.0?cmin front of one lens. obtain the total magnification
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