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If you also want 15kW of heat in your home, how much power does the heat pump require to make this happen? (The answer is less than 15)
A boat takes 4.0 hr to travel 36 km down a river, then 6.0 hr to return. How fast is the river flowing?
You have a new job designing rides for an amusement park. In one wide, the rider's chair is attached by a 9.0-m-long chain to the top of a tall rotation tower.
It takes 15 kilowatt hours of electrical energy to produce 1 kg of aluminum metal from aluminum oxide by the Hall-Heroult process.Compare this value with the amount of energy necessary to melt 1 kgo
What minimum initial speed should the puck have been given so that it reached the teammate, assuming that the same force of kinetic friction acted on the puck everywhere between the two players?
A styrofoam cup calorimeter is calibrated by adding heat to the water in it with an electrical heater. When 1,350 J of heatis added the temperature of the calorimeter raises by 3.5 degreesC.
These lasers use pulses of very intense radiation to literally blast away material. The pulses are generally 10.243 ns long and carry an energy of 2.02 mJ each. If the radiation has a wavelength of
Write the Lewis formula that the best describes the charge distribution in the sulfuric acid molecule, H2SO4, according to the rules of formal charge.
Hydrogen peroxide solutions sold in drug stores contain 3.0%of H2O2 Hydrogen peroxide decomposes into water and oxygen gas. according to the balenced chemical equation
By what numerical factor does the multiplicity of the water change? (The physical system here is the water, first existing as ice then as vapor.) Express your answer as 10^some power.
Explain how the properties of polarity and hydrogen bonding affect such phenomena as surface tension and solubility in water.
How would you show by experiment how rusting is affected by environment? Would you expect the surfaces rusted evenly?
When we rotate the polarizer, does the intensity of the reflected ray change? Which kind of polarization takes place here? Why? Please use your best judgment when answering this question.
One hiker suggests they walk on another 50 m to avoid inaccurate compass readings caused by the current. Compared to the earth's magnetic field, is the current from the transmission line really a pr
A very dilute solution of silver nitrate is added dropwise to asolution that contains equal concentrations of sodium chloride andpotassium bromide. which salt will precipitate first?
A rifle with a weight of 30 N fires a 5.0 g bullet with a speed of 300 m/s. (a) Find the recoil speed of the rifle. (b) If a 700 N man holds the rifle firmly against his shoulder, find the recoil sp
A buffer is prepared by mixing 185 mL of 0.439 M NaOH with 855 mLof 0.869 M sodium bicarbonate (NaHCO3). Given that theKa1 of H2CO3 is 4.5 x10-7 and the Ka2 is 4.7 x 10-11,calculat
To get the boat moving, you throw the stones rearward, either in succession or together, but in each case with a certain speed 15.000 m/s relative to the boat. a.) What is the resulting speed of the
How do you calculate the concentration(molarity) of hydronium ion in a solution made by dissolving 1.90gof hydrogen chloride in enough water to make 0.642L of solution?and how do you calculate the p
They each hear a frequency greater than the 512.0Hz as the fork moves towards them; the difference in the frequencies they hear is 6.84Hz. Determine their respective distances below the overpass. Th
A 100 mL sample of hard water is titrated with the EDTA solutionin problem 2. The same amount of Mg2+ is added,, and the volume of EDTA required is 22.51 mL.
A person starts from rest at the top of a large, frictionless, spherical surface, and slides into the water below. At what angle ? Does the person leave the surface? (Hint: When the person leaves th
The crest of the second hill is circular, with a radius of r = 34 m. Neglect friction and air resistance. What must be the height h of the first hill so that the skier just loses contact with the sn
If we wish to prepare a buffer with a pH of 9.39 from amixture of bicarbonate and carbonate, what ratio of carbonate:bicarbonate concentration should we use? (pKa2for carbonic acid is 10.25)
Upon leaving the runway at point B, the particle is traveling straight upward and reaches a height hf = 3.8 m above the floor before falling back down. Ignoring friction and air resistance, find the