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Charge of 5.00 x 10-9 C and a charge of -4.00 x 10-9 C are separated by a distance of 60.0 cm. Find the position at which a third charge, of 14.0 x 10-9 C, can be placed so that the net electrostatic force on it is zero.
A plastic bag is filled with hydrogen at atmospheric pressure and 18.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 44.0 kg girl off her..
An unstretched spring is 13.0 cm long. When you hang an 845 g weight from it, it stretches to a length of 16.0 cm. What is the force constant (in N/m) of this spring
An ?-particle has a charge of +2e and a mass of 6.64 ? 10-27 kg, What is the speed of the ?-particle and What is the radius of its circular path
A point source of sound waves emits sound uniformly in all directions. What is the power output of the source
Calculate the efficiency of a fossil-fuel power plant that consumes 450 metric tons of coal each hour to produce useful work at the rate of 900 MW
the nucleus of a atom an isotope of the element xenon with mass 125 is 6.0 in diameter. it has 54 protons and charge
Alpha Centauri is 4.3 light years away. If we could make a rocket that went 4/5 the speed of light: What would the travel time be for the astronauts
A proton (q = 1.60×10?19C , m = 1.67×10?27kg)moves in a uniform magnetic fieldB? =( 0.490T )i^. What is the magnitude of the magnetic force acting on the proton
A 150g copper bowl contains 220 g of water, both at 20.0degrees C. A very hot 300g copper cylinder is dropped intothe water, What is the original temperature of the cylinder
The siren on an ambulance is emitting a sound whose frequency is 2050 Hz. The speed of sound is 343 m/s. find the wavelength and frequency of the sound you hear
The intensity of an electromagnetic wave is 8 x 10^7 W/m^2. What is the amplitude of the magnetic field of this wave
A guitar string has a tension on it of 6500 N and length of 1.2 m. what is the linear mass density of the string
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