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A student who weighs 556 N climbs a stairway (vertical height of 4.0 m) in 25 s.
(a) How much work is done?
(b) What is the power output of the student?
A material contains a high concentration of BaO and Al2O3. If its composition were changed to reduce the BaO concentration, and increase the SiO2 concentration. Would viscosity at some given temperature be higher or lower with the new concentratio..
NH3 is a weak base (Kb = 1.8 × 10-5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.088 M in NH4Cl
In addition, presume that each activated adenylyl cyclase catalyzes the conversion of 20 ATP molecules to cAMP per second. Presume that each G protein activates a single unique adenylyl cyclase. Compute the number of moles of cAMP that are produce..
Consider a gas with pressure = 1 atm, 1 mole of molecules, and a temperature of 295 K. R=0.082 atm*L/(mol * K). How much volume should this gas occupy
calculate the air velocity necessary to suspend 1.5 cm (screened) particles of shredded aluminum; ps = 2.70 g/cm^3 and r= 0.0012 g/cm^3.
Question- How much work must be done on a system to decrease its volume from 11.0 L to 4.0 L by exerting a constant pressure of 5.0 atm
What would the concentration (or activity) of Hg2+(aq) be in the solution if equilibrium existed between the water in soil pores, the gas and cinnabar
Calculate the normality of a KMnO4 solution if 32.38 mL of a 0.1431 N Fe2+ solution is required to react with 15.92 mL
An enzyme (MW = 20,250) catalyzes the hydrolysis of a newly discovered substrate. The kcat was found to be 2000 sec-1 and Km = 0.05 M. Using this information answer the following questions.
Estimate the temperature at which calcium carbonate is likely to decomp under 1atm of pressure. Reaction: CaCO3(s) -> CaO(s) + CO2 (g) For this rxn: dHstandard = 177.8 kJ and dS standard= 160.5 J/K (notice unit differences)
To analyze the Cu(NO3)2 in an experiment we constructed a plot of absorbance vs. concentratio, commonly called a calibratioin curve. The absorbance at the top of the peak
A particular metal has a specific heat of 0.061 cal/(g C). How much heat must be lost from 25.00 grams of this metal for the temp to drop 65.2C
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