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A third charge of +10.4 micro-Coulombs is placed at x = -0.25 m, y = 0 m. At what angle is the total electric filed is directed at the the point x = 0 m, y = +0.17 m if measured counter-clockwise fr
There is a "dead-air" layer next to your skin that acts as insulation. If the dead-air layer is 5.0 thick, what is the person's rate of heat loss by conduction?
Point charges of +2.00nC and -5.00nC are arranged on two of the vertices of an equilateral triangle. Find the magnitude and sign of the third charge which must be placed at the 3rd vertex of the tri
A rechargeable battery is constructed based on a concentrationcell constructed of two Ag/Ag+ half-cells. The volume of eachhalf-cell is 2.0 L and the concentrations of Ag+ in the half-cells are 1.35
A parallel-plate air-filled capacitor having area 44 cm2 and plate spacing 5.0 mm is charged to a potential difference of 850 V. Find the following values. (a) the capacitance
Hydrochloric acid is usually purchased in a concentration form that is 37.0% HCl by mass and a density of 1.20 g/mL. What volume ofconcentrated HCl is required to prepare 2.0L of 0.500 M HCl?
For a science fair competition, a group of high school students build a kicker-machine that can launch a golf ball from the origin with a velocity of 39.5 m/s and initial angle of 30.4° with res
Water softeners often replace calcium ions with in hard water with sodium ions. However, the FDA recommends that adults ingest lessthen 2.5g of sodium per day.
In the Bohr model of the hydrogen atom, an electron in the 5th excited state moves at a speed of 8.76 x 104 m/s in a circular path of radius 1.32 10-9 m. What is the effective current associated with
The Ksp of the phosphate fertilizer CaHPO4. 2H2O is 2.7 x 10-7 at 25oC.what is the molar concentration of a saturated solution? What mass of this compound will dissolve in 3.0 L of water at thi
A plane, diving with constant speed at an angle of 49.0° with the vertical, releases a projectile at an altitude of 510 m. The projectile hits the ground 7.00 s after release. How far did the pr
In the deep ocean, a water wave with wavelength 95 m travels at 12 m/s. Suppose a small boat is at the crest of this wave, 1.2 m above the equilibrium position. What will be the vertical position of
Use the pKa values to predict which functional groups in the amino acids aspartic acid and phenylalanine are expected to be protonated int he presence of acetic acid.
A point charge +2Q is at the origin and a point charge -Q is located along the x-axis at x=d. Find a symbolic expression for the net force on a third point charge +Q located along the y-axis at y= d
If the initial velocity of the ball is horizontal, what minimum magnitude must it have if the ball is to clear the net?
If the pressure exerted by ozone, O3, in the upper stratosphere is 2.28 torr of Hg and the temp is 250k, how many molecules of ozoneare in one liter? (1 mole of any gas contains 6.022 x 10^23molecul
Draw the Lewis structure of the perbromate ion with an octet on bromine and one example of each resonance form with an expanded octet on bromine. Using formal charges, determine the best structure f
If the mass of the point charge is 5.5 kg, how far does the charge travel before it stops due to the electric force alone (ignore weight force)? Answer in meters
Compare the bond order of the carbon-to-carbon bond in the diatomic molecule C2 that you would establish from a Lewis structure and from a molecular orbital diagram. Why are the not the same?
It swings to an angle of 28.8 degrees with the vertical before coming to equilibrium (taking into account weight - do not ignore weight). If the mass of the charge is 3 kg, what is the surface charg
An electrochemical cell passes 2 moles of electrons for its balanced equation as written. At 290.97 K, the cell voltageis 0.88272 volts. At 256.65 K, the cell voltage is 1.06459volts.
An object hangs from a spring balance. The balance registers 31 N in air, 21 N when this object is immersed in water, and 29 N when the object is immersed in another liquid of unknown density. What
A certain batch of fireflies were observed to "flash" at the rate of 10.9 times per minute at 25°C and at the lower rate of 5.9 times a minute at a temperature of 15°C.
Three identical electrically charged balls, each of mass 2 kg are suspended from a common point with strings of the same length. if the electric repulsive force between any pair of charged balls is
A positively charged particle with a charge of 10.2pc is suspended in equilibrium in the electric field between two oppositely charged horizontal parallel plates. The square plates each have a charg