Determining the value of the charge
The electric potential at a position located a distance of 18.9 mm from a positive point charge of 8.70×10-9 C and 13.9 mm from a second point charge is 1.42 kV. Calculate the value of the second charge.
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Percent confident of the results with an error of plus or minus $1.50, and if this same type of study conducted last year had a standard deviation of about $29.25, the appropriate sample size for this study would be approximately
A 85cm3 block of iron is removed from an 800oC furnace and immediately dropped into 200 mL of 20oC water. What fraction of the water boils away?
A tank open to the atmosphere initially contains 2 lb of liquid water initially at 80°F and 0.4 lb of ice initially at 32°F. All of the ice melts as the tank contents attain equilibrium.
Air at 200 kPa and 950 K enters an adiabatic nozzle at low velocity and is discharged at a pressure of 80 kPa. If the isentropic efficiency of the nozzle is 92 percent.
A supersonic nozzle is also a convergent-divergent duct, which is fed by a large reservoir at the inlet to the nozzle. In the reservoir of the nozzle, the pressure and temperature are 10 atm and 300 K, respectively.
Determine (A) the mass flow rate through the nozzle, (B) the exit temperature of the air, and (C) the exit area of the nozzle. Assume constant specific heats at 300 K.
A concrete pipe with an inside and outside diameter of 60 cm and 70 cm, respectively, hangs from cables. The pipe is supported at two locations, and a spreader bar maintains cable segments AB and AC at 45 degrees.
A capacitor consists of two closely spaced metal conductors of large area, separated by a thin insulating foil. It has an electrical capacity of 4000.0 oF and is charged to a potential difference of 66.0 V. Calculate the amount of energy stored in
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