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An atom has only two levels, a ground state with energy -25.0 eV and an excited state with energy -20.0 eV. What wavelength photon is required for stimulated emission of an electron in the excited state?
If the sphere is enclosed in a room whose walls are kept at -5°C, what is the net flow rate of energy out of the sphere
Two sqaures of wire like that of above are placed side by side on a table with a distance of 8 cm between the closest sides of the two sqaures, What is the resulting force between the two squares
A 303 turn solenoid has a radius of 5.00 cm and a length of 22.0 cm. Find the inductance of the solenoid
When two resistors are connected in a parallel configuration the voltages across each are the same, What are the currents through these resistors
A small object with a mass of 380 mg carries a charge of 35.0 nC and is suspended by a thread between the vertical plates of a parallel-plate capacitor. The plates are separated by 5.00 cm. If the thread makes an angle of 12.0° with the vertical, ..
An 18.0 g rifle bullet travelling 245 m/s buries itself in a 3.50 kg pendulum hanging on a 3.00 m long string, which makes the pendulum swing upward in an arc. Find out the vertical and horizontal components of the pendulum's displacement.
An electron field of 8.50e5 V/m is desired between two parallel plates each of area 45cm^2 and seperated by 2.45 mm of air
You need to determine the density of a ceramic statue. If you suspend it from a spring scale, the scale reads 28.4N. What is the density
John can hit a golf ball 310m on earth. on the moon's surface, g=1/6 gravity of earth, so how far could he hit the same ball if he could only achieve half an initial velocity achieved on earth.
A uniform plank of length 4.7 m and weight 221 N rests horizontally on two supports, with 1.1 m of plank hanging over the right support. To what distance x can a person who weighs 440 N walk on the overhanging part of the plank before it just begi..
A certain freely falling object requires 1.10s to travel the last 32 m before it hits the ground. From what height above the ground did it fall.
The coefficient of volume expansion of coffee is the same as that of water. How much coffee (in cubic meters) has spilled out of the beaker.
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