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A half-wave antenna works on the principle that the optimum length of the antenna is half the wavelength of the radiation being received. What is the optimum length of a car antenna when it receives a signal frequency of 94.7 MHz?
Point charges located at 3, 8, and 11 cm along the x - axis are represented in the figure (at 3cm +q, 8cm -2q, 11cm +q). What is the magnitude of the force on the charge
What is the magnetic field strength. Consider a ladder 5 meters tall, and a 150 kg weight on top of it. The ladder is leaning against the wall.
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. What is the mass of the unknown element
A circular coil enclosing an area of 140 cm2 is made of 190 turns of copper wire. The wire making up the coil has resistance of 3.0 Ohms, what is the average current in the coil during that time
Two small identical conducting spheres are placed with their centers 25 cm apart. One is given a charge of 20.0 nC and the other given a charge of -36.0 nC. What is the electrical force of each sphere on the other?
As a function of time, the velocity of the football can be written as . (If the acceleration of an object is constant, find the average acceleration vector of the football
When a potential difference of 221 V is applied to two plates of a parallel-plate capacitor, the inner surface of the positive plate carries a surface charge density of 40 nC/cm2. What is the spacing between the plates
Fleas can jump quite high; experiments show that they reach an altitude of 130 times their own height when they jump vertically! Suppose instead that a flea can jump, What is the take-off speed for this flea
A satellites are placed in a circular orbit that is 3.64 × 107 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance
Unpolarized light with an electric field amplitude of 4.70 V/m is incident on a polarizer, What is the electric field amplitude of the transmitted light
Using a simply pulley/rope system, a crewman on an Arctic expedition is trying to lower a 5.52 kg crate to the bottom of a steep ravine of height 23.9 meters. At what speed will the crewman hit the bottom of the ravine
Jerry applies a force of 155 N to the propeller. The distance of the from where the force was applied to the axis of rotation is 1.19 m. What is the torque on the propeller
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