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Suppose the maximum safe average intensity of microwaves for human exposure is 1.00 W/m2Part (a) Part (b) E0. Early radar units leaked radiation more than modern ones do, which caused identifiable health problems, such as cataracts, for people who worked near them.
If a radar unit leaks 6.5 W of microwave radiation uniformly in all directions, what is the closest distance, in centimeters, you can be to the unit and still be considered safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection.
What is the maximum electric field strength, in volts per meter, of the microwave radiation at the maximum safe intensity?
A cryogenic storage container holds liquid helium, which boils at 4.2 K. Suppose a student painted the outer shell of the container black, turning it into a pseudo-blackbody, and that the shell has an effective area of 0.40 m2 and is at 3.3 102 K.
A very long straight solenoid with a cross-sectional area of 5.85 cm2 is wound with 44 turns of wire per centimeter, and the windings carry a current of 0.240 Amp. Obtain the average induced emf in the secondary coil
What is the direction of the net force on q3? where along the x axis can q3 be placed and the net force on the zero, other than the trivial answers of x= +infinity and x= -infinity.
A black body has a mass of 3.76 kg, specific heat of 2000 J/(kg· C°), surface area of 0.214 m2, emissivity 1.00, and initial temperature 99° C. The surroundings are at a temperature of 18.6° C.
Three capacitors are connected in series. The equivalentcapacitance of this combination is 3.03µF. Two of the individual capacitances are 6.30 µF and 9.09µF. What is the third capacitance (in µF)?
An circuit consists of a 50Ω resistor in series with a 60.0 Hz source. A voltmeteracross the resistor reads 34.0 V. What is the rms current in this circuit?
A solid ball and a hollow ball, each with a mass of 2.29 kg and radius 0.115 m, start from rest and roll down a ramp of length 2.77 m at an incline of 32.7°
A hockey puck is given an initial speed of 5.4m/s. how far does the puck slide before coming to rest
A battery's ideal voltage is 12.0 V; its internal resistance is 1.46 ohms. If the battery is attached in series to a 21.5-ohms resistor, what is the actual voltage supplied by the battery?
If a force of 13 Newtons is applied in the +x direction, what is the amount of friction acting on the mass in Newtons?
A crate travels 30 m due to a constant force of 350 N. The friction can be neglected for the first 15 m. What is the final speed of the crate if it weighs 110 kg
Consider a parallel plate capacitor having plates of area 1.25 cm^2 that are separated by 0.016 mm of neoprene rubber. You may assume the rubber.
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