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At a dosage of 18 micrograms/kilograms body weight, how many milligrams of digitalis should a 180 lb. patient receivec
A sample contains 8.90×104 radioactive nuclei. In a time of 5 minutes, 1.90×103 of the nuclei decay. Evaluate the half life of the sample
A 150MW laser pulse is focused with a lens to a diameter of 1.0?m. What is the laser beam's electric field amplitude at the focal point
Looking out the window of a train you observe the passengers on a second train moving in the opposite direction at a constant velocity. determines which of the two trains is actually moving
Based on activation energies and energy changes and assuming that all collision factors are the same, answer the following questions: Which of the following reactions would be fastest in the forward
A satellite with 2 rectangular solar cells wings with A=60m2, when the wings normally face the sun with an intensity I=1200 W/m2, how much force on the satellite due to the sunlight
Light of 546 nm wavelength is incident on a cesium surface that has a work function of 1.91 eV. find the threshold wavelength
Consider a balloon being filled up with oxygen. You have approximately 30 moles of oxygen gas in this balloon with volume 1.3m3, what is the temperature of the molecules
A .464 g sample of a metal, M, reacts completely with sulfuric acid according to M+H2SO4 yields MSO4+H2. A Volume of 211 mL of H is collected over water, the water level in the collecting vessel is
Does nitro compounds cause any harmful effect on living things?
The elements X and Y form a compound that is 66.67% X and 33.33% Y by mass. The atomic mass of X is twice that of Y. What's the empirical formula?
A planar electromagnetic wave is propagating in the +x direction. What is the Poynting vector at the point P at that instant
A Volume of 211 mL of H is collected over water, the water level in the collecting vessel is the same as the outside level. Atm Pressure is 756 Torr and the temp is 25 degree C. Calculate atomic mas
If the standard heat of rxn for the rxn is calculated to be -567.4 kJ/g mol FeS2(s) what is the value of Delta Hrxn will you use per kg of FeS2 burned in an energy balance
The decomposition of nitric oxide NO to N2 and O2 is second order with a rate constant of 0.0796 M^-1 S^-1 at 737 C and 0.0815 M^-1 S^-1 at 947 C. Calculate the activation energy.
For the elementary process N2O5 (g) = NO2(g) + NO3 (g) the activation energy (Ea) and overall Delta E are 154 KJ/mol, and 136 KJ/mol, respectively. What is the activation energy of the reverse react
Compare the rms speeds. Compare the average kinetic energy. -Consider equimolar samples of the same ideal gas at the same temperature, but different volumes. Sample A has a larger volume than Sample
A cylinder contains a piston on each side of which is one kilomole of an ideal gas. The walls of the cylinder are diathermal, compute the change in the Helmholtz potential
A 4 kg dog stands on one end of a 20 kg boat. The dog is initially 6 m from the shore, How far has the boat moved after the dog has walked the 2m
A gas mixture is made by combining 7.2g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 92.04L. What is the molar mass of the unknown gas in g/mol, and identify
Consider two capacitors in air each with a capacitance C, both capacitors then were filled with liquid having a dielectric constant k, What is produced heat
The activation energy of a certain reaction is 32.3kJ/mol . At 20 degrees C, the rate constant is 0.0130s^-1. At what temperature would this reaction go twice as fast? The equation that is given is
A textbook of mass 1.90kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.150m, What is the tension in the part of the cord attached
Consider the formation of nitryl fluoride: 2NO2+F2=2NO2 the reaction is first order in F2 and second order overall. what is the rate law