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A hydraulic press consists of two vertical cylinders of circular cross-sectional areas 6cm2 and 120cm2 that are joined at the base. The press contains oil of relative density 0.93, and the friction
When 15.12 mL of 0.1194M NaOH is added to 25.00 mL of 0.1246M HX (an unknown weak acid), the resulting pH is 5.9. What is the Ka of the unknown acid?
Additioonal Feat! Dexter and Mandark team up in order toprevent the asteroids from destroying Earth. They start thisplanet saving feat by weighing a gelatin capsule (0.117g) Next they add pieces of
Dexter and Mandark team up in order to prevent theasteroids from destroying Earth. They start this planet savingfeat by weighing a gelatin capsule (0.117 g) Next theyadd pieces of aluminum/zinc allo
Calculate the molecular formula of diazomethane, assuming thecompound is 28.6% C, 4.8% H, and 66.6% N by mass and the density ofthe gas is 1.72 g/L at 250C and 1.00 atm.
Assume your are given a brain which weighs 1.45 kg andcontains 7.70e10 cells. If each cell was a cube, and had a densityof 1.0 g/mL
How would you not tell the difference between the three? Usinig the technique in the lab (we measured the samequantities of water using two different measuring devices andcompared them using a t tes
Americium-241 is used in smoke detectors. It has a rate constant for radioactive decay of k =1.6x10-3yr-1. How much of a 1.00-mg sample of Americium-241 remains after three half-lives?
What is the maximum solubility of ferrous ion in an anaerobicpH 10 solution containing 10-6 M sulfide(S2-)? Will FeS or Fe(OH)2 precipitatefirst?
A laser emits a pulse of light containing 7.99 ×10-15 J of energy at a frequency of 3.32 ×1015 Hz. How many photons are present in the pulse?
Determine the molecular weight of the Venusian atmosphere assuming that it consists of 95% CO2 and 5% N2 by volume. What is the gas constant for 1 kg of such an atmosphere? (43.2 g mol-1, 192.5 J k
Calculate the amounts of NaCl that would need to be added to 100 mL of 0.001 M KHP to give four ionic strengths between 0.01 and 0.50. Take into account that KHP ionizes completely in solution, add
a) calculate the upward force on the larger piston due to a downward force of 30N on the smaller one.
A ball is thrown straight up in the air with a velocity of 40 m/s. What is the speed of the ball right before it hits the ground? (neglecting air resistance) How long will the ball be in the air?
If 50.0 g of copper(I) oxide and 25.8g of copper(I)sulfide are initially present, determmine the teoretical yield of copper. Indicate excess reagent.
Determine the maximum speed of the blocks if the spring is compressed the distance foundi n part (d).
A solution containing the biotinylated nanoparticles and streptavidin is initially prepared, and this solution is put incontact with the surface.
The human body can survive an acceleration trauma incident (sudden stop) if the magnitude of the acceleration is 250m/s2. If you are in an automobile accident with an initial speed of 105km/hr (65 m
A 0.355 g sample of a solid, monopractic acid having a molecular weight of 12g/mol requires 18.47 mL NaOH for neutralization. Calculate the molarity of the NaOH solution.
A proton accelerates from rest in a uniform electric field of 640 N/C. At some later time, its speed is 1.20X10^6 m/s. Find the magnitude of the acceleration of the proton. How long does it take the
Caffeine, C8H10N4O2,is a stimulant found in tea and coffee. A sample of the substance was dissolved in 47.0 g of chloroform,CHCl3, to give a 0.0920m solution. How many grams of caffeine were in the
A student adds 4.00g of dry ice (solid CO2) to an emptyballoon. What will be the volume of the balloon at STP after allthe dry ice sublimes (converts to gaseous CO2)?
One diver runs off the edge of the cliff, tucks into a "ball," and rotates on the way down with an average angular speed of 1.6 rev/s. Ignore air resistance and determine the number of revolutions s
A skier starts from rest at the top of a hill. The skier coasts down the hill and up a second hill. The crest of the second hill is circular with a radius of 36 m. Neglect friction and air resistanc
A particular brand of gasoline has a density of 0.737 g/mL at 25degrees C. How many grams of this gasoline would fill a 12.0 galtank?