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A parallel-plate capacitor has fixed charges +Q and-Q. The separation of the plates is then doubled. By what factor does the energy stored in the electric field change?
A beam contains 4.0 108 doubly charged positive ions per cubic centimeter, all of which are moving north with a speed of 1.3 105 m/s
A straight 2.00-m, 150-g wire carries a current in a region where the earth's magnetic field is horizontal with a magnitude of 0.55 gauss. a) What is the minimum value of the current in this wire so that its weight is completely supported by the m..
A storage tank 27 m high is filled with pure water, Calculate the magnitude of the net force that acts on a square access hatch at the bottom of the tank that measures 0.6 m by 0.6 m
A weather balloon is designed to expand to a maximum radius of17m at its working altitude, what is its radius at liftoff
A certain satellite travels in an approximately circular orbit of radius 9.1 × 106 m with a period of 8 h 39 min. Calculate the mass of its planet from this information
q1. when a surface is irradiated with light of wavelength 4950 a a photo current appears that vanishes if a retarding
Two batteries in parallel, each of emf 10 V and internal resistance 0.5 ?, are connected to an external 20 ? resistor. Find the current in the external resistor.
Two sinusoidal waves of the same frequency travel in the same direction along a string. what is the amplitude (in cm) of the resultant wave
Rhea, one of Saturn's moons, has a radius of 765 km andan acceleration due to gravity of 0.278 m/s2 at itssurface. Calculate its mass and average density
25g of copper pellets are removed from a 300 degrees C oven and immediately dropped into 90 mL of water at 25 degress C in an insulated cup. What will the new water temp be
An ideal gas at 0 degrees Celsius consists of 1.0x10^23 atoms. 16J of thermal energy are added to the gas. What is the new temperature in Degrees Celsius
A volume of nitrogen gas has a density of 1.15 kg/m3 and a pressure of 1.07 atm. Find the temperature of the gas and the rms speed of its molecules
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