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A model airplane of mass 0.790 kg is flying at constant speed in a horizontal circle at one end of a 26.0 m cord and at a height of 11.0 m. What is the acceleration of the plane
Calculate the amount (mL) of Compound A needed to give 12 mmol. MW of Compound A: 32.04 g/mol Density of Compound A: 0.79 g/mL
A large block 19.0 cm wide, 20.0 cm long, and 24.00 cm high of mass 4.55 kg. This block is passing through air (density ?air = 1.43 kg/m3). Calculate the terminal velocity of the block
Calculate the solubility-product constant for PbF2. Ksp = (c) The Ksp of ZnSe at 25 oC is 3.60e-26. What is the molar solubility of ZnSe? solubility = mol/L
A 48.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.44 102 m/s from the top of a cliff 152 m above level ground, How much work has been done on th
Barium azide is 62.04% Ba and 37.96% N by mass. Assuming that barium exists as its most stable cation in the above compound, what is the molecular formula of barium azide, how many nitrogen atoms co
What is the pH of this buffer? pH = (b) What is the pH of the buffer after the addition of 0.56 mol of NaOH? (assume no volume change) pH = (c) What is the pH of the original buffer after the additi
Calculate the standard enthalpy of formation of gaseous carbon dioxide (CO2) using the following thermochemical information: 2 C(s) + H2(g) C2H2(g) H = +226.8 kJ 2 C2H2(g) + 5 O2(g) 4 CO2(g) + 2 H2O
At 5 oC the equilibrium constant for the reaction: 2 HBr(g) H2(g) + Br2(g) is KP = 2.80e-16. If the initial pressure of HBr is 0.00991 atm, what are the equilibrium partial pressures of HBr, H2, and
A coil of four circular loops of radius 3.0cm carries a current of 5.0A clockwise, What is the magnetic field at the center of the coil
Calculate the concentration of the acid solution after all the metal has reacted.
Bead A has a mass of 14g and a charge of -4.5nC . Bead Bhas a mass of 28g and a charge of -11.8nC. What maximum speed is achieved by each bead
Compute the concentration in molarity of an NaOH solution if 25 ml of solution is needed to neutralized 19.1 ml of 0.305 M HCl solution
A river that is 207 m wide flows due east at a uniform speed of 1.9 m/s. What is the magnitude of the boat's velocity
A cube of brass, 2 cm on a side, is heated until the temperature of the brass is 75oC. The cube is quickly added to 100 mL of water at 23oC. What is the final temperature of the mixture? The specifi
A car heading north collides at an intersection with a truck heading east. If they lock together and travel at 28 m/s at 22° north of east just after the collision
If 30 ml of 0.150M cacl is added to 40ml of 0.1 M AgNo3. What is the mass of AgCl preciptate
What percentage of the Ca2 (aq) can be separated from the Ag (aq) by selective precipitation? hint: Ksp for Ag2SO4 is 1.20×10^-5 Ksp for CaSO4 is 4.93×10-5
A sample of 0.836 gm of unknown compound containing barium ions Ba2+ is dissolved in water and treated with an excess of Na2So4. If the mass of BaSo4 precipitat formed 0.7403 gm, what is the percent
The concentration of NaCl in solution is 0.25 M. What volume of solution contains 5.0 g NaCl. A. 1.4 L B. 73 mL C. 340 mL D. 2.9 L
The minimum volume % of vapor that gives a combustible mix is called the lower flammable limit (LFL). Generally, the LFL is about half the stoichiometric mixture, the concentration required for comp
Most geologists believe that the dinosaurs became extinct 65 million years ago when a large comet or asteroid struck the earth, What percentage is the earth's speed around the sun
How many grams of NaCl are needed to make a 5.0% w/v saline solution having a total volume of 300.0 mL
The wheel of a racing car is rotating at 200 rpm at a given instant of time. In the next minute it makes 100 revolutions. The angular acceleration of the wheel is
How many grams of MgCl2 are needed to make a 3.35% w/v solution having a total volume of 500.0 mL