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Question: A cell phone sends and receives electromagnetic waves in the microwave frequency range. Explain the physics of how an oscillator creates these waves.
Show all work, use additional paper if necessary.
by measuring the go-and-return time for a laser pulse to travel from an earth-bound observatory to a reflector on the
Does current through a power supply increase when parallel bulbs are added? what is the current through the power source
Two converging lenses, each of focal length 14.5 cm, are placed 59.2 cm apart, and an object is placed 27.4 cm in front of the first. Where is the final image relative to the second lens formed
A shaving/cosmetic mirror is designed to magnify your face by afactor of 1.3 when your face is placed 20.0 cm in front of it. what is the focal length and the radius of curvature of the mirror
A hydrogen atom is in its first excited state (n = 2). Using the Bohr theory of the atom, calculate (a) the radius of the orbit, (b) the linear momentum of the electron.
When a potential difference of 168V is applied to the plates of a parallel-plate capacitor, the plates carry a surface charge density of34.0nC/cm2. What is the spacing between the plates?
A duct has an initial cross-sectional area of 0.58 m2. If the initial velocity of the air moving through the duct is 9.5 m/s, find what does the cross-sectional area have to be to increase the velocity to 15.0 m/s
A 368 gram mass vibrates according to the equation x = 0.370sin(6.95t) where x is in meters and t is in seconds. Find the total energy
black smokers are hot volcanic vents that emit smoke deep in the ocean floor. many of them teem with exotic creatures
A styrofoam box used to keep drinks cold at picnic has total wall area(including the lid) of 0.80m2 and wall thickness 2 cm. it is filled with ice, water and cans at 0 Celsius. What is the rate of heat flow into the box if temperature of the outsi..
A pulley in the form of a uniform disk has a rope hanging over it.The circumference of the pullet is 1.2m and the pulley's mass is2.2 kg. The rope is 8m long and has a mass of 4.8 kg. When the difference in heights between the two end of the rope ..
A skier leaves the horizontal end of the ramp with a velocity of 25m/s and lands 70 meters from the base of the ramp. How high is the end of the ramp above landing area
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