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Assume you have a 3.60 m solution that depressed the freezing point of the solution by 0.851°C. What is the molal freezing point depression constant (Kf) of the solution?
A train has a maximum speed 20m/s which it can achieve at an acceleration of 0.25m/s with its brake fully applied, the train has a deceleration of 0.5m/s². What is the shortest time the train can travel between two stations 800m apart if it's stops at both stations?.
If you use 5.76mol of sodium fluoride (NaF) and dissolved this into 3.62 kg of water, what will be the change in the boiling point of your solution. Assume the Kb of water is 0.51°C/m.
A company determines that in order to sell x
x
items the price per item, in dollars, must be p(x)=1830
p(x)=1830. The company also determines that the total cost, in dollars, to produce x x
items is given by C(x)=3100+610x+1.5x2C(x)=3100+610x+1.5x2.
How many items must the company produce and sell in order to maximize profit?
The company must produce and sell
Assume that yo-yo drops 1.0 m vertically from its owner's hand at a uniform speed of 0.80 m/s along its string. At the end of the string, it changes direction in 0.10 s and rises toward the owner's hand at a uniform speed of 0.60 m/s. Compute the average acceleration of the yo-yo at the bottom end of the string as it changes direction.
A mass m = 0.1 gram is hanged on a string inside a bus. The bus is accelerating at a constant rate of 5 m/s^2. At what angle will the mass deflect from the vertical? (in degrees)?
A particle at opposition r=I+ 2j+ 3k is acted upon by a force F 2= 4i +5j +6k.
Evaluate the torque experienced by the particle.
A body moves from a position r²=(I + 2j –3k) meter under the influence of constant force F=( 3i +3–k) Newton. Calculate the work done by the force.
A double riveted lap joint is made between 15mm thick plates. The rivet diameter and pitch are 25 mm and 75 mm, respectively. If the ultimate stresses are 400 MPa in tension, 320 MPa in shear and 640 MPa in crushing, find the minimum force per pitch which will rupture the joint. If the above joint is subjected to a load such that the factor of safety is 4, find out the actual stresses developed in the plates and rivets.
1. A mole of N2 has a pressure of 2.30 atm inside a 20.0 L vessel. What is the volume that the gas occupies if it is compressed to a pressure of 8.45 atm at constant temperature?
2.A sample of air in a container was analyzed to contain 0.390 mol N2, 0.102 mol O2 and 0.0085 mol other gases. What are the partial pressures of these gases in the container if the total pressure is 754 mm Hg?
3.What is the mass of ethanol that must be combusted to generate 20.4 L of CO2 at STP?
4.F2(g) (M=38.00 g/mol) effuses through a pinhole at a rate of 0.01287 mol/s. At what rate does N2O4(g) (M=92.02 g/mol) effuse at the same pinhole?
