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We have a 10,000 pound weight (of any configuration, size or shape) lifted to a height of 50 feet by a construction crane. What is the best and most efficient method to create compressed air with such
A 1 kg toy raft floats on water with 68% of its volume submerged. A lead block is placed on the raft and the raft is then fully submerged with the lead block just above the surface of the water. Fi
An athlete at the gym holds a 2.4 kg steel ball in his hand. His arm is 76 cm long and has a mass of 4.0 kg. What is the magnitude of the torque about his shoulder if he holds his arm in each of the
A 240 g , 23.0-cm-diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply to take the disk from 0 to 1500 rpm in 5.00 ?
Chlorine consists of two major isotopes with the following atomic masses: 35Cl (34.9689 amu) and 37Cl (36.9659 amu). The average atomic mass of chlorine is 35.4527 amu. Calculate the percent of eac
What is the maximum speed with which a 1300- car can round a turn of radius 76 on a flat road if the coefficient of static friction between tires and road is 0.45?
The white precipitate is AgCl(s) and the clear, colorless liquid consists of Na+(aq), NO3-(aq), and H2O(l). Identify the chemical components in Solutions A and B.
If the bullet-block system compresses the spring by a maximum of 80.0 cm, what was the speed of the bullet at impact with the block?
The Henry's law constant for O2 in water at 25 °C is 1.66 ´ 10-6 M/mm Hg. What partial pressure of O2 is necessary to achieve an equilibrium concentration of 0.150 M O2?
An organic substance has an enthalpy of vaporization of 29.0 kJ/mol. The compound has a vapor pressure of 524 mm Hg at 25 °C. At what temperature is the vapor pressure equal to 115 mm Hg?
Calculate its average speed. Calculate its average velocity for the entire trip, using "away from the trainer" as the positive direction.
On a hot summer day, a young girl swings on a rope above the local swimming hole. When she lets go of the rope her initial velocity is 2.25 m/s at an angle of 35 degrees above the horizontal. If she
HF(aq), and hydrocholoric acid, HCl (aq), are found in the lab. When tested, they both have a pH of 1. Which acid is more concentrated, HF or HCl?
What is the dominant intermolecular force or bond that must be overcome in converting CO2 from a liquid to a gas?
What is the mole fraction of 1.98 m Fe(NO3)3(aq)? The molar mass of Fe(NO3)3 is 241.9 g/mol and the molar mass of water is 18.02 g/mol.
A white solid precipitate forms. What happens to the mass of the mixture after the solid precipitate forms? Choose the best answer.
Condensation occurs on a bathroom window at a rate of 0.5kg per hour. If the bathroom air is at 26 Deg C and fully saturated with water vapour, calculate approx the rate of heat transfer on to the w
A 34 kg child sits in a swing supported by two chains, each 3.1 m long. If the tension in each chain at the lowest point is 283 N, find the child's speed at the lowest point.
What is the mole fraction of MgCl2 in a solution that is 11.04% by mass MgCl2(aq)? The molar mass of MgCl2 is 95.21 g/mol.
The dry solid weighs 0.397 g. Use this mass and dillution volumes to calculate the actual molarity of the sulfuric acid in the initial solution
What velocity would a proton need to circle Earth 1000 km above the magnetic equator, where Earth's magnetic field is directed horizontally north and has a magnitude of 4.00 10-8 T?
The specific heat capacity of silver is 0.235 J/g K. Its melting point is 962 C and its enthalpy of fusion is 11.3 kJ/mol. What quantity of heat in joules is required to change 5.00 g of silver from
A 2.52- sample of a compound containing only carbon, hydrogen, nitrogen, oxygen, and sulfur was burned in excess to yield 4.36 of and 0.892. Calculate the empirical formula of the compound.
A rocket of total mass 2630 kg is traveling in outer space with a velocity of 167 m/s. To alter its course by 38.0^circ, its rockets can be fired briefly in a direction perpendicular to its original
What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m.