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When an 89.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 1.80 x 103 J. By how much does the potential energy of a 18.0
If the reaction N2(g) + 3H2(g) ! 2NH3(g) is carried out at constant temperature and pressure, how much H2 is required to react with 6.4 L liters of N2?
A loudspeaker of mass 21.0 is suspended a distance of = 2.20 below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of = 3.30 .
To what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
Using Newton's laws, calculate , the magnitude of the normal force that the floor exerts on the chair.
A 2.50 g bullet, traveling at a speed of 395 m/s, strikes the wooden block of a ballistic pendulum, such as that in the figure below. The block has a mass of 265 g. How high does the combination ri
Lipitor,a pharmaceutical drug that has been shown to lower "bad"cholesterol levels while raising "good" cholesteral levels inpatients taking the drug, had over $11 billion in sales in 2006.Assuming
What is the acceleration of two falling sky divers (mass 113.0 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight?
An element has two isotopes with masses of 62.9396 u and 64.9278 u,and 30.83% of the atoms are the heavier isotope. Calculate the atomic mass of this element and give its name and symbol.
The spring constant for the tendon is the same for both groups, 33 N/mm. What is the difference in maximum stored energy between the sprinters and the nonathletes?
How much heat is required to raise the temperature of 0.362kg of copper from23.0C to 60.0 C. The specific heat is 0.920 (g. C).
The volume (in m3 at STP) and composition of the off-gases when air 20% (by volume) in excess of the theoretical requirement is used.
A rifle with a barrel length of 64 cm fires a 9 g bullet with a horizontal speed of 450 {rm m/s}. The bullet strikes a block of wood and penetrates to a depth of 12 cm.
The concentration of C20H42 (FM 282.55) in winter rainwater is 0.2 ppb. Assuming that the density of rainwater is close to 1.00 g/mL, find the molar concentration of C20H42.
A 13 g bullet traveling 236 m/s penetrates a 2.0 kg block of wood and emerges cleanly at 179 m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bull
Determine the work done by (a) the force F (b) gravity (c) the normal force between the block and the wall
What is the potential energy for the child just as she is released, compared with the potential energy at the bottom of the swing?
The first-order bright fringe is a distance of 4.84 mm from the center of the central bright fringe. For what wavelength of light will the first-order dark fringe be observed at this same point on the
3 isotopes of argon occur in nature. Ar-36, Ar-38, and Ar-40. The abundance of each are as follow: 0.34%, 0.07%, and 99.59%, calculate the average atomic weight of argon.
A pendulum is 0.80 m long and the bob has a mass of 1.0 kg. At the bottom of its swing, the bob"s speed is 1.6 m/s. A) What is the tension in the string at the bottom of the swing? B) Explain why th
The combustion of 45.0 g of methane (natural gas) releases 2498 kJ of heat energy. How much energy in kilocalories kcal would combustion of 0.670oz of methane release?
The titration required 287 s at a constant current of 24.25 mA to reach the endpoint.& ; Calculate the percentage of As2O3 (197.84 g/mol) in the insecticide
A 40.4g sample of glucose (a nondissociated, nonvolatile solute with the formula C6H12O6) is dissolved in 152.4 g of water. what is the vapor pressure of this solution at 100c?
A piece of silver with a total mass of 12.31 g was placed in a graduated cylinder filled with 10.00 mL of water. The density of silver is 10.50 g/mL. What will be the final volume in the graduated c
Both teenagers pull with a force of 55 at an angle of 35 relative to the forward direction, which is the direction of motion. In addition, the snow exerts a retarding force on the sled that points o