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Derive the equations for the equivalent resistance of resistors in parallel and in series. What happens to the current as more resistors are added to a series circuit? to a parallel circuit?
Consider the analysis of manganese in flour by atomic absorption. A 0.1015g sample of flour digested with H2SO4 and then H2O2 and the digest solution was diluted to 50 ml.
A proton is released in a uniform electric field, and it experiences an electric force of 2.8 multiplied by 10-14 N toward the south. What are the magnitude and direction of the electric field?
Derive a formula for the magnetic field at an arbitrary point on the z-axis. Note by symmetry that B(x) = Bz(z) k.
Acid Phosphatase was assayed at [S] = 2x10-5 M. The Km for the substrate was 5x10-4 M. At the end of one minute 2.5% of the substrate, pNPP, had been converted to pNP (a product).
If a green leaf has an area of 2.75cm^2 and solar radiation is 1030 W/m^2, how many photons of solar radiation strike the surface of the leaf per second? Assume 3 significant figures and an average
Calculate the number of moles of Nitrogen dioxide that could be prepared from 0.35 mole of nitrogen monoxide and 0.25 mole of oxygen: 2NO(g)+O2(g) -> 2NO2(g)
What is the pressure (in atmospheres) inside a container of gas connected to a mercury-filled open-end manometer when the level in the arm connected to the container is 28.3cm higher than the level
Calculate the entropy change associated with the conversion of 0.75 moles of water at 50 Celcius to -10 celcius. The molar heat capacity of water is 75.3 J/mol celcius and the molar heat capacity of
If the height gain of each step was 0.20 m, and the man's mass was 57.0 kg, what was his average power output during the climb? Give your answer in both watts and horsepower.
A juggler performs in a room with a ceiling 1.95 m above hand level. What is the maximum upward speed (in m/s) which she can give a ball without letting it hit the ceiling?
The magnetic field at distance 3R from the center of the wire is 0.77 T. Determine the magnetic field at distance R/2 from the center of the wire.
A circular wire of radius 5.19 cm has a current of 3.81 A flowing in it. The wire is placed in a uniform magnetic field of 5.27 mT. a) Determine the maximum torque on the wire.
The ring has zero radial velocity at its initial position, a distance of r0 = 0.295 m from the fixed end. Determine the radial velocity of the ring as it reaches the moving end of the rod.
If a 120 lb. soil is placed in the wheelbarrow with its center of gravity 1.5 ft. from the axle, what force is required to raise the legs of the wheel barrow?
A sample of gas contains 50.0% helium and 50.0% xenon by mass. What are the partial pressures of each gas when the total pressure is 750. torr? Hint: assume a 100. g sample of gas.
Magnesium ions can be precipitated from seawater by the addition of sodium hydroxide. How much sodium hydroxide in grams must be added to a sample of seawater to completely precipitate the 89.2 mg
A spring is hanging vertically from a ceiling. (Assume the spring's mass is negligible.) I hang a 0.5kg mass on the spring and let the spring slowly stretch to an equilibrium position.
Discuss briefly the similarites and differences between all known kinds of intermolecular forces. Use mathematical expressions to support your discussion.
What are the concentrations of hydrogen ion and acetate ion in a solution of 0.10M acetic acid, HC2H3O2? What is the pH of the solution? What is the degree of ionization? Ka = 1.7 x 10^-5
Use energy conservation to find the distance along the incline that the block slides before coming to rest.
Calculate the change in enthalpy for the Mg HCl reaction using standard enthalpies of formation delta hf for HCl aq equals -167.2 kj and delta hf for MgCl2 aq equals -791.2 kj?
Vanadium is a transition metal that uses its s an d orbitals to form five bonds with fluorine atoms in VF5. What nonmetal could replace vanadium in VF5 without changing the geometry of the molecule?
Drops of rain fall perpendicular to the roof of a parked car during a rainstorm. The drops strike the roof with a speed of 12m/s, and the mass of rain per second striking the roof is 0.035 kg/sec.
A radioactive substance has a half-life of 46.5 minutes. How many grams of the radioactive substance will remain in a 822.4g sample after four hours have elapsed?