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If the river velocity is 40 cm/sec and the longitudinal dispersion coefficient is0.1 m2/ sec, what is the maximum concentration expected at the plant.
What is the acceleration of two falling sky divers (mass 106.0 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight?
What is the density of silver if a solid ingot has a volume of 50 cm^3 and a mass of 525g
The half life for the first order decomposition if this compound is 20500 s. how long will it take for a sample of N2O5 to decay to 60% of its initial value?
The blade of a windshield wiper moves through an angle of 90.0 in 0.46 s. The tip of the blade moves on the arc of a circle that has a radius of 0.37 m. What is the magnitude of the centripetal acce
You are designing a drier that must evaporate 200 lb/h of H2O from sludge by using air. Air at 70°F and 50% relative humidity is drawn into the drier and it leaves at 140F and 70% relative humid
If the sample had not been filtered, how much of this chemical would have been measured? Express in terms of measured concentration C (mg/litre) of the filtered sample?
The second-order diffraction (n = 2) for a gold crystal is at an angle of 22.20° for X rays of 154 pm. What is the spacing between these crystal planes?
A river flows due east at 1.70 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 15.0 m/s due north relative to the water. a) What is the v
A sealed syringe contains 5cc of oxygen gas under 14.7psi of pressure. If the pressure on the syringe is increased to 36.8psi, but the temperature remains constant, what is the volume of the oxygen
What is the new temp. in degrees celsius, when the volume of the sample is charged at constant pressure and volume of 6.00L
A child is riding a merry-go-round which completes a revolution every 8.36 s. The child is standing 4.65 m from the center of the merry-go-round. What is the magnitude of the centripetal acceleratio
Calculate the value (calories) for the heat of solution of 4.00 g of NaOH. Calculate the number of calories that would be produced if one mole of sodium hydroxide was dissolved.
How much work is done (a) by the block on the spring and (b) by the spring on the block? (c) What is the value of h0? (d) If the block were released from height 3h0 above the spring, what would be t
A 2.80-cm diameter coin is placed a distance of 25.0 cm from a convex mirror which has a focal length of -12.0 cm. Determine the image distance and the diameter of the image.
A solution of 350mg of optically active 2-butanol in 10 mL of water, placed in a 20 cm cell shows an optical rotation of +6 .24o. What is the specific rotation of this compound?
What mass of water (in grams)is contained in 2.8L of the vapor above this solution at 55 celcius? the vapor pressure of pure water at 55 celcius is 118 torr.
A vertical cylindrical cylinder, closed at the bottom end, contains 0.0100 moles of gas. It is fitted at the top with a piston, which can move freely. The mass of the piston is 14.0 kg and the init
A stone of mass 0.31 kg is tied to a string of length 0.50 m and is swung in a horizontal circle with speed v. The string has a breaking-point force of 45 N. What is the largest value v can have wi
How many elastic scatters, on the average, are required to slow a 1-MeV neutron to below 1 eV in (a) 16O and in (b) 56Fe?
Only 1.40 mg of pure penicillin having an activity of 280 cpm was recovered. What was the penicillin content of the original 5.00 kg of crude penicillin?
A quarterback takes the ball from the line of scrimmage, runs backward for 7.50 yards, and then runs sideways parallel to the line of scrimmage for 15.0 yards. At this point, he throws a forward pas
A racing car travels with a constant tangential speed of 75 m/s around a circular track with a radius 625 m. Find (a) the magnitude of the car's total acceleration and (b) the direction of its tota
A 88.0 N grocery cart is pushed 13.0 m along an aisle by a shopper who exerts a constant horizontal force of 40.0 N. If all frictional forces are neglected and the cart starts from rest, what is th
A 0.20 M solution of MgSO4 has an observed osmotic pressure of 7.6 atm at 25oC. Determine the observed van't Hoff factor for this experiment. A) 19 B) 0.31 C) 1.6 D) 1.8 E) 2.0