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A positive charge of +2.00 nC exerts an upward 0.200 N force on an unknown charge located 30.0 cm directly below it. Calculate the magnitude of the charge and enter the answer with proper sign for the charge in units C.
Two 10 cm-diameter charged thin rings face each other, 20 cm apart. The left ring is charged to 20 nC and the right ring is charged to +20 nC. What is the electric field.
A small fan has blades that have a radius of 0.0600 m. When the fan is turned on, the tips of the blades have a tangential acceleration of 19.6 m/s2as the fan comes up to speed
A photon with wavelength λ is absorbed by an electron confined to a box. As a result, the electron moves from state n = 1 to n = 7. Find the length of the box. Express your result using h, m, c, and lambda to represent Planck's constant, the electron..
A 0.954-kg toy car is powered by four AA batteries (6.00 V total) connected directly to a small DC motor. compute the average current supplied to the car\'s motor?
Consider an optical gain medium that has two levels at E 1=1.50 eV and E 2=3.50 eV. What is the stimulated emission wavelength
What is an average number of ozone molecule
A motorcycle and a police car are moving in the same direction, with the motorcycle in the lead. What frequency does the motorcyclist hear in this case
A tank circuit in a radio transmitter is a series RCL circuit connected to an antenna. find minimum and maximum inductance of the tank circuit
a proton and an electron have the same kinetic energy upon entering a region of constant magnetic field. What is the ratio of the radii of their circular paths?
A current of 7.93 A in a long straight wire produces a magnetic field of 7.75 µT at a certain distance from the wire. Find this distance in meters
Gamma-ray bursters are objects in the universe that emit pulses of gamma rays with high energies. What is the wavelength of the these gamma rays
The displacement of a wave traveling in the positivex-direction is y(x,t)=(3.5cm)cos(2.7x?92t), wherex is in m and t is in s, What is the wavelength of this wave
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