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A simple generator has a coil with area A=0.02m2, which is rotated at frequency f=60Hz (remember that angular frequency is 2*pi*f) in a B=0.5T magnetic field. How many windings (number of turns N) are needed if the generator is to develop an average power of P=0.05kW if the total resistance in the circuit is R=0.14kiloOhms?N = turns
The plate on the back of a certain computer scanner says that the unit draws 0.38A of current from a 120V , 60Hz line. Find the average square of the current
A ball has a diameter of 3.9 cm and average density of 0.0839 g/cm3. What force is required to hold it completely submerged under water
A rat with an emissivity of .40, total area of .15m^2 and a temperature of 37C. How much energy must the rat's body generate to maintain a skin surface of 37C in a 24 hour period
If 20 grams of hot water at 80°C is poured into a cavity in a very large block of ice at 0°C, what will be the final temperature of the water in the cavity? How much ice should melt in order to cool the hot water down to this temerature.
An artificial earth satellite has a circular orbit of radius 7.10 multiply.gif 106 m in an equatorial plane. Compute the (constant) speed of the satellite
Consider an airplane window (area 0.34 m2). If the pressure inside the plane is atmospheric pressure and the pressure outside is 18% of Patm, what is the force on the window
A 0.57-mH inductor and a 131-? resistor are placed in series with a 24-V battery. What is the maximum energy stored in the inductor
A mass system with a spring constant of 66.0 N/m undergoes simple harmonic motion with a period of 0.628 s. what is the total energy of the oscillation
How much energy is lost through your hands in one minute after touching on a cold surface at 10 C compared to being exposed to cold air at 10 C
A 1050kg car carrying four 78kg people travels over a rough "washboard" dirt road with corrugations 4m apart which causes car to bounce on its spring suspension.
A string 0.5 m long with mass density 0.0003 kg/m and is vibrating 200 cycles per second. What hanging mass would produce this tension
The Mariana trench is located in the Pacific Ocean at a depth of about 11 000 m below the surface of the water. The density of seawater is1025 kg/m3. determine the weight of a jetliner
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