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A car travels up a hill at a constant speed of 41 km/h and returns down the hill at a constant speed of 80 km/h. Calculate the average speed (in km/h) for the round trip.
Calculate the concentration of a benzoic acid solution (weakmonoprotic acid) if the equivalence point of a titration on 10.00mLof benzoic acid was reached after adding 22.61mL of 0.1062MNaOH.
The guns, once fired, lanuched self-accelerating bullets with a constant horizontal acceleration of 7 meters per second squared. Guns were fired perfectly horizontally to hit the human targert as it
A particular radioactive isotope has a half-life of 15.0 days. If you have 18.3 mg of the isotope at the beginning of the week, how many milligrams would you have 43 days later?
What safety precaution should you follow when working with theGas Chromatogram injection port? What will raising the temperature of the column do toretention times? How will it affect separation effic
A person walks in the following pattern: 4.9 km north, then 1.5 km west, and finally 3.0 km south. (a) How far (in km) and (b) at what angle (measured counterclockwise from east) would a bird fly in
A black of mass m sliding on a frictionless table is attached to a horizontal string that passes through a tiny hole in the table.
A uniform stick is held horizontally and then released. At the same instant, one end is struck with a quick upwards blow. If the stick ends up horizontal when it returns to its original height, what
The laser in most supermarket barcode scanners operates at awavelength of 632.8 nm. What is the energy of a single photonemitted by such a laser? What is the energy of one mole of these photons?
A pendulum is made of a uniform stick of length L. It is allowed to swing in a vertical plane. Where should the pivot be placed on the stick so that the frequency of (small) oscillations is maximum?
The shark tank at an aquarium houses 5 sharks that deplete theaquarium water of a total of 50.00 grams of oxygen per hour. Waterfrom the tank is diverted through a bubbler unit that oxygenatesthe wa
A mercury barometer reads 770.0 mm on the roof of a building and 785 mm on the ground. Assuming a constant value of 1.29 kg/m3 for the density of air, determine the height of the building.
An object floats in water, with 55% of its volume submerged. What is its approximate density?
The equation, A = a*b*c becomes nonlinear at high concentrations of the absorbing substance. Suppose you prepare a solution with a very high absorbance that is suspect in not following the linear re
what is the tension in the string when the second ball directly beneath the first ball?
If you were monitring the titation by visible spectroscopy, what wavelength would you select for the data analysis? Why? How would you determine the end point of the tittaion based on the the recor
Positive point-charges of +16.5 μC are fixed at two of the vertices of an equilateral triangle with sides of 2.45 m, located in vacuum. Determine the magnitude of the E-field at the third vertex.
Terephthalic acid, used in plastics manufacture, contains only C, H, and O. Combustion of 19.81 mg of terephthalic acid sample produces 41.98 mg CO2 and 6.45 mg H2O. What is the empirical formula
If you were monitring the titation by visivle spectroscopy, what wavelength would you select for the data analysis? Why? How would you determine the end point of the tittaion based on the the recore
Three point charges have equal magnitudes, two being positive and one negative. These charges are fixed to the corners of an equilateral triangle, as the drawing shows. The magnitude of each of the
If a 1.00-g piece of gold (density = 19.32 g/cm3) is hammered into a sheet measuring 8.0 x 5.0 ft, what is the average thickness of the sheet in meters?
A spot of paint on a bicycle tire moves in a circular path of radius 0.33 m.When the spot has traveled a linear distance of 1.67 m, through what angle has the tire rotated? Give your answer in radia
A point is located in a polar coordinate system by the coordinates r= 2.5 m and 0= 35 degrees. Find the x- and y- coordinates of this point, assuming that the two coordinate systems have the same or
A body has a mass of 2000 kg. Determine the weight of the body expressed in N if it is (a) located on the surface of the earth, (b) it is located in a satellite orbiting at an altitude of 30,000 m,
What is the magnitude of the gravitational attraction between Saturn and Earth expressed in N. Assume that Earth and Saturn are aligned so that a straight line can be drawn from the sun through Eart