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Q. You have a great summer job working in a cancer research laboratory. Your team is trying to construct a gas laser that will give off light of an energy that will pass through the skin but be absorbed by cancer tissue. You know that an atom emits a photon (light) when an electron goes from a higher energy orbit to a lower energy orbit. Only certain orbits are allowed in a particular atom. To begin the process, you calculate the energy of photons emitted by a Helium ion in which the electron changes from an orbit with a radius of 0.30 nanometers to another orbit with a radius of 0.20 nanometers. A nanometer is 10-9 m. The helium nucleus consists of two protons and two neutrons.
How much work did the movers do (horizontally) pushing a 150- crate 10.2 across a rough floor without acceleration, if an effective coefficient of friction was 0.50.
Conclude the electric field at the origin
Two insulated wires, each 2.50 m long, are taped together to form a two-wire unit that is 2.50 m long. One wire carries a current of 7A; the other carries a smaller current I in the opposite direction. The two wire unit is placed at an angle of 78..
If his arms are capable of exerting a force of 1400 on the vine, what is the maximum speed he can tolerate at the lowest point of his swing? His mass is 82, and the vine is 6.00 long.
A 0.95 kg air-track glider is attached to each end of the track by two coil springs. It takes a horizontal force of 0.500 N to displace the glider to a new equilibrium position, x= 0.130 m.
A uniform disk turns at 4.3 around a frictionless spindle. A nonrotating rod, of the same mass as the disk and length equal to the disk's diameter, is dropped onto the freely spinning disk.
An electric vehicle starts from rest and accelerates at a rate of 1.6 m/s2 in a straight line until it reaches a speed of 20 m/s. The vehicle after that slows at a constant rate of 1.4 m/s2 until it stops. (1) How much time elapses from start to s..
What is the magnitude
If a person radiates about 66 W of power at room temperature, how long does it take for person to radiate away the energy acquired by consuming a 230 Calorie doughnut.
An electron accelerated from rest through the voltage of 500V enters a region of constant magnetic field. If the electron follows a circular path with a radius of 17cm, what is the magnitude of magnetic field.
What is the minimum rate of rotation, in revolutions per minute, required for the spheres to contact the cylinder wall?
Two 2.0cm x 2.0cm plates that form a parallel-plate capacitor are charged to (+/-) 0.708 nC.what are the electric field strength inside and the potential difference across the capacitor if the spacing between plates.
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