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A ball is thrown upward from a platform 4.6 m high with a speed of 16 m/s, What is the magnitude of its velocity when it hits the ground
(a) What was the molar concentration of acetic acid in the vinegar (b) Assuming the density of the vinegar to be 1.1 g/mL, what was the percent (by mass) of acetic acid in the vinegar
what is the molar mass of the solute? The boiling point elevation constant for water is .512 C/m.
A 0.1kg ball is attached to a string and whirled around in a circle overhead, What is the maximum speed the ball can have when the radius of corcle is 1m
The pH of .750 M sodium hypochlorite, NaClO, is 10.72. What is the pKb for this base
A high-voltage transmission line with a resistance of 0.335 ?/km carries a current of 1.45 kA, What fraction of the transmitted power does this loss represent
The small skydiver, weighing 50N, sinks 1.0m into the snow when her parachute does not open, Determine the work done by the snow in stopping the person
what is the molar solubility of caf2 in 0.10 m naf solution at 25°c? the ksp for caf2 is 1.5 x 10^-10
A buffer is prepared by combining 25 mL of .50 M NH3(aq) with 25 mL of .20 M HCl. What is the pH of the buffer? (Ka(NH4^+)=5.6 x 10^-10)
Two blocks (A and B) are in contact on a horizontal frictionless surface. A 40N constant horizontal force is applied to A. The mass of A is 5.0kg and the mass of B is 20kg
The vapor pressure of water at 20°C is 17.5 mmHg. What is the vapor pressure of water over a solution prepared from 2.00 × 102 g of sucrose (C12H22O11, molar mass = 342 g/mol) and 3.50 &ti
How and to what extent does peasant production represent exploitation? In which ways did it generate internal inequality? What were the consequences of “Southern African mining revolution”
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box, determine acceleration of the box
what is the solubility of O2 at an elevation of 12,000 ft where the atmospheric pressure is 0.657 atm? Assume the temperature is 25°C, and that the mole fraction of O2 in air is 0.209 at both 12
How does the study of pirates (during the golden age) provide insights into the struggles over, and tensions within, the new emerging social order?
a student placed in an unknown sample plate thin layer chromatography and develops in dichloromethane as solvent. only there is a spot whose Rf is 0.95. This indicates that the unknown material is a
The archerfish hunts by dislodging an unsuspecting insect from its resting place with a stream of water expelled from the fish's mouth, What is the vertical component of the water's initial velocity
Create an original table or chart compare and contrast distinguishing elements or features of early Greek and Roman cultures, including illustrative or significant examples of the various features.
Lead nitrate, Pb(NO3)2, reacts with sodium sulfate, Na2SO4, to make lead sulfate, PbSO4, and sodium nitrate, NaNO3. How much lead sulfate can one make from 65.05 g lead nitrate and 55.02 g sodium su
Describe the nature of the Muslim commonwealth. How was it different from the caliphates that came before?
The fluorocarbon C2Cl3F3 has a normal boiling point of 47.6°C. The specific heats of and C2Cl3F3(g) are 0.91 J/gK and 0.67 J/gK, respectively. The heat of vaporization of the compound is 27.49 k
What is the single biggest reason the Umayyad dynasty fell, in your opinion? What could have prevented it from falling?
How did the Mongol Empire become so enormous? What were the reactions to the Mongols in the Middle East?
Why do people consider the period around the time of Harun al-Rashid the Golden Age of Islam?
calculate the speed of an electron that is accelerated through the same potential difference, and Calculate the speed of a proton