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A charge of -2.85 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass, which has a radius of 0.105 m. The charges on the circle are -3.8 µC at the position due north and +4.55 µC at the position due east. What are the magnitude and direction of the net electrostatic force acting on the charge at the center? Specify the direction relative to due east.
What is the speed of the cart if the man suddenly starts running to the left with a speed of 9-m/s relative to the cart.
How to compute for the density of dark matter estimate mass density of dark matter in the solar neighbourhood. Express the answer in units of kg m-3, Msun pc-3, Msun AU-3.
A 5.4-µC point charge is located at x = 0.9 m, y = 3.3 m, and a -3.9-µC point charge is located at x = 1.9 m, y = -1.9 m. (a) Find the magnitude and direction of the electric field at x = -3.2 m, y = 0.9 m.' (b) Find the magnitude and direction of..
The K-shell ionization energy of copper is 8979 eV. The L-shell ionization energy is 951 eV. Determine the wavelength of the Kα emission line of copper. What should be the minimum voltage be on an x-ray tube with a copper target in order to see the K..
An electric motor turns a flywheel by a drive belt that joins a pulley on the motor and a pulley that is rigidly attached to the flywheel. The flywheel is a solid disk with a mass of 50.0kg and a diameter of 1.00m.
How many revolutions does the ball make during its fall. Now assume that the ramp is frictionless, so that the ball slides instead of rolling. Through what horizontal distance d does the ball move before landing in this case.
A 1040 kg car carrying four 80 kg people travels over a rough "washboard" dirt road with corrugations 2.0 m apart that causes the car to bounce on its spring suspension. The car bounces with maximum amplitude as its speed is 21 km/h. The car now stop..
The change in the kinetic energy of the system
If the current in the circuit is 0.15 A and the resistances are R1 = 100 ? and R2 = 260 ?, what is the emf of the battery.
what is the equivalent resistance between points A and B?
The spheres are given the same electric charge Q and it is found that they come to equilibrium when each string is at an angle of 5 with the vertical. Each string is 30 cm long.
As you sit facing your computer screen, electrons are directed from a source at the back of the computer toward you and are deflected by a magnetic field. Which direction must the magnetic field be oriented in order to direct the electrons to the ..
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