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The average output power of a GSM cellular phone is 1.0W when it is "ON". The phone can be treated as a point source of E-M waves emitting spherical waves.
(a) Calculate the intensity and peak electric field E(max) of the phone's E-M waves in your brain, which is about 5.0cm away from the phone when it is applied directly against year ear.
(b) What is the intensity and peak electric field of E-M wave inside a microwave oven, whose area of cross-section is A=0.25m x 0.30m and the average E-M wave power is 500-W.
(c) How the electric field in (a) compares with the safety regulation of EPA for microwave oven, which says that leaking of more than 5% of the E-field from the oven is harmful to the human body.
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In a hydraulic system with a large and a small piston, you wish to lift a 1130 kg car sitting on the large piston that has a diameter of 28.2 cm, What is the diameter of the small piston
Suppose you hook up some AC circuit with a combination of inductors, capacitors, and resistors, and you are measuring the voltage across one of these elements. You set up the oscilloscope so that it is set to .5 VOLTS/DIV, and 5 ms/DIV and observe th..
A 51.5-g Super Ball traveling at 29.5 m/s bounces off a brick wall and rebounds at 19.0 m/s. What is the magnitude of the average acceleration of the ball during this time interval
the relationship between the frequency of the incident light, the threshold frequency
A 380kg piano slides 3.2m down a 27â degrees incline and is kept from accelerating by a man who is pushing back on it parallel to the incline, What is the force exerted by the man
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a lens is made of glass having an index of refraction of 1.5. one side of the lens is flat and the other convex with a
What mass of steam at 100°C must be mixed with 464 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 19.0°C
In an experiment by a helium-neon laser with a wavelength of 632.8nm, you illuminate a double slit that is positioned 3.0m from a screen. There are 12 bright fringes spanning a distance of 52mm. What is the spacing (in mm) among the slits?
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