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A sinusoidal electromagnetic wave emitted by a cellular phone has a wavelength of 34.0cm and an electric-field amplitude of 4.30×10?2v/m at a distance of 200m from the antenna. Calculate
A sinusoidal electromagnetic wave from a radio station passes perpendicularly through an open window that has area of 0.600m^2. How much energy does this wave carry through the window
Solve an equilibrium problem (using an ICE table) to calculate the pH 1)a solution that is 0.13M in NH3 and 0.15M in NH4Cl 2) 185.0 mL of 0.12M C2H5NH2 with 265 mL of 0.20M C2H5NH3Cl
A solution is made that is 1.1×10^?3 M in Zn(NO3)2 and 0.150 M in NH3. After the solution reaches equilibrium, what concentration of Zn2+(aq) remains
Potassium hydroxide is used to precipitate each of the cations from their respective solution. Determine the minimum concentration of KOH required for precipitation to begin in each case. A - 2.8*10
An experimental measurement has a result 7.95 +- 0.01, and a predicted value of 8.00. What is the percent uncertainty in the measurement
Consider a solution that is 1.1*10^-2 M in Ba2+ and 2.0*10^-2 M in Ca2+. A - If sodium sulfate is used to selectively precipitate one of the cations while leaving the other cation in solution, which
A boy throws up a ball 15m/s, how high will the ball go and what is the duration (total time) in the air from throw to catch
What is the pH at the equivalence point in the titration of 25.00 mL of 0.020 M NH3 with 0.015 M HBr? Kb for NH3 = 1.8 x 10^-5
A stunt man drives a car at a speed of 20 m/s off a 24-m-high cliff. The road leading to the cliff is inclined upward at an angle of 20? How far from the base of the cliff does the car land
Potassium hydroxide is used to precipitate each of the cations from their respective solution. Determine the minimum concentration of KOH required for precipitation to begin in each case. A - 1.4*10
A small sphere of mass m= 7.60 g and a charge q1 = 29.9 nC is attracted to the end of a string, what is the smallest value d can have before the string breaks
Compare and contrast these methods of extraction- Solid phase extraction, liquid liquid extraction, Supercritical fluid extraction, Derivatization, and solid-phase microextraction
A vector has components of 7.0 units along the x axis and 9.0 units along the y axis. What is the angle between the vector and the x axis
Raindrops fall 1500 m from a cloud to the ground. If they were not slowed by air resistance, how fast would the drops be moving
A ball bearing is dropped from rest at a point A. At the instant it passes a mark 4.5 m below A, How far does the second bearing fall in that time
Calculate the ratio of solubility of Mg(OH)2 dissolved in pure H2O to Mg(OH)2 dissolved in a 0.180 M NaOH solution? Express your answer numerically to three significant figures.
A helium atom (m= 6.6465 x 10^-27 kg) collides elastically with an oxygen atom (m = 2.6560x10^26kg) at rest. Find the speed of the oxygen atom
At the 18th green of the U. S. Open you need to make a 20.5 ft putt to win the tournament. Assuming the deccelration caused by the grass is constant, what should the initial speed have to be to make t
If the system is allowed to expand as N2 is added at a cosntant total pressure of 1 bar, what will be the equilibrium degree of dissociation when the N2 partial pressure is 0.6 bar
A model rocket is fired upward. The rocket's average initial acceleration is 40.5 m/s2 until the fuel burns out in 0.805 s. How high does the rocket go
The stock solution of KMnO_4 has a concentration of 2.6 X 10 ^ -4M. The pipette has a volume of 10.0mL. What is the amount of KMnO_4 delivered to the solution, in moles
If a cat repeatedly rubs against your cotton slacks on a dry day, the charge transfer between the cat hair and the cotton can leave you with an excess charge of -2.00 ?C. How many electrons are tran
The movie has been moved to the position where about half of the F^2+ solution has been added. At this stage, what quantity of Fe^2+, in moles have been added to the beaker for each mole of MnO
A particle of charge +2.56 x 10-6 C is 12.4 cm distant from a second particle of charge -1.55 x 10-6 C. Calculate the magnitude of the electrostatic force between the particles