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An electron is placed at the origin of a coordinate system O, close to the surface of the Earth. A second electron is placed on the Y-axis at coordinate y so that the electrostatic force on the electron at the origin balances the gravitational force. A) calculate the y coordinate of the second electron.
Four identical charges (+1.9 ?C each) are brought from infinity and fixed to a straight line. Determine the electric potential energy of this group
A series ac circuit contains a 250? resistor, a 20.0mH inductor, a 3.50?F capacitor, Find the average power delivered to the entire circuit
Imagine that Earth is struck by a meteor with a mass of 5.23 x 1015 kg, and a speed of 8100 m/s. What speed would such a meteor give Earth in a head-on collision
An atom is ionized so that it has only one electron. When the electron drops from the n = 4 shell to the n = 1 shell, an X-ray of wavelength 155.61 pm is emitted. What is the atomic number
Ball A is dropped from the top of a building of height h at the same instant that ball B is thrown vertically upward from the ground. At what height does the collision occur
Sketch a free-body diagram of the plank. How far can a painter of mass 70.0 kg walk on the overhanging part of the plank before it tips.
Two identical capacitors are connected in parallel to an ac generator that has a frequency of 579 Hz and produces a voltage of 24 V. What is the capacitance of each capacitor
A professor's office door is 0.99 m wide, 2.2 m high, 4.2 cm thick; has a mass of 27 kg, and pivots on frictionless hinges. what is its angular acceleration immediately afterward
Two 1.50 V batteries -- with their positive terminals in the same direction -- are inserted in series into the barrel of a flashlight. What is the lamp's resistance
You have a cup containing 220 g of freshly brewed coffee which, at 75C, is too warm to drink. estimate how much the entropy of the universe increases
The magnetic field inside the solenoid in the figure changes at the rate of1.4T/s. A conducting coil with 2000 turns surrounds the solenoid, as shown. The radius of the solenoid is6cm, and the radius of the coil is7cm. What is the potential differenc..
Suppose the 6.0-V battery is replaced by a battery of unknown emf, and an ammeter measures I1 = 1.2 A. Find the other two currents and the emf of the battery
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