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Air "breaks down" when the electric field strength reaches 3*10^6 N/C, causing a spark. How many electrons must be transferred from one disk to the other to create a spark between the disks
The sound level of a single vacuum cleaner is about 75dB and a television is about 55dB. What is the sound level number
An ideal gas is compressed isothermically by a force of 85 newtons acting through .24 meter. Calculate values of delta U and q.
The magnetic field between the poles of an electromagnet is 2.17 T. A coil of wire is placed in this region so that the field is parallel to the axis of the coil. How many turns are there in the coi
Components dropping 10, 20, 30, and 50 volts what is the V applied. What is the algebraic sum of the voltages around a closed loop
What should the mole percent of oxygen be in the diving gas for the partial pressure of oxygen in the mixture to be 0.21 atm, the same as in air at 1 atm
Assume that you exhale the air at your body's temperature of 37 oC with relative humidity of 80%. Will you see your breath
Estimate the air pressure at the cloud base from the problem 1 assuming isothermal atmosphere with the average temperature between the cloud base and the surface
An astronaut is being tested in a centrifuge. The centrifuge has a radius of 9.6 m and, in starting, rotates according to ? = 0.34t^2, find the magnitudes of the astronaut's angular velocity
What is value of the activation energy, Ea, for this reaction. What is the value of the pre-exponential factor (sometimes called the frequency factor), A, for this reaction
A nonconducting spherical shell of inner radius R1 and outer radius R2 has a uniform volume charge density ?. find the total charge on the shell
C12H10, is a nonvolatile, non-ionizing solute that is soluble in benzene, C6H6. At 25 degrees celcius, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution mad
A thin hemispherical shell of radius R has a uniform surface charge, Find the electric field at the center of the base of the hemispherical shell
A rifle is aimed horizontally at a target 1,699.92 m away. The bullet hits the target 2.18 inch below the aim point. determine the bullets time of flight
A solution is made my mixing equal masses of methanol, CH4O and ethanol, C2H6O. Determine the mole fraction of each component to at least three significant figures.
A twofold increase in the initial concentration of A leads to a 1.41-fold increase in the initial rate. what is reaction order
Close the side neck of the flask with a rubber pipette bulb (or vacuum line in case of high mp substances), and then place ice water in the centrifuge tube.
one capacitor with two flat conductors are seperated with 4mm. the area of each plate is 5m^2. one plate has charge of +200mC , calculate the capacitance of the device
A 190 g ball moving at 0.45 m/s in the + x- direction is subject to a 0.15 N force in the - y- direction for 2.5 s. Find the magnitude of the ball's momentum change
The coefficients of friction between a block of mass 1.0 kg and a surface are ?s = 0.75 and ?k = 0.40. What is the magnitude of the frictional force
Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron atom. Molecular oxygen binds irreversibly to the Fe(II) atom in heme.
Find the change in momentum of a 1140kg car that increases its speed from 4.5 m/s to 18.0 m/s in a time of 19s while travelin in the same direction
A certain reaction has an Eact of 62.3 kj/mol (14.9 kcal/mol) and a frequency factor of 7.15X10^8LXmil-1Xsec-1. use the arrhenius equation to calculate the rate constant for this reaction at 35 degr
An object starts from rest at time t = 0.00 s and moves in the +x direction with constant acceleration. compute the acceleration of the object
Estimate the pH range over which the color change occurs for bromocresol green. What would be the effect on your results if methyl red indicator, pKa =5.0 were used during the experiment