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How many grams of water must be added to 519.5 grams of methanol (CH3OH) at 20°C to have an osmotic pressure of 408 mm of Hg? Methanol has a density of 0.8921 g/mL.
A skier of mass 66 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 75 m up a 30° slope (assumed frictionless) at a constant speed of 2.1 m/s?
Earth's atmosphere, the electric field above Earth's surface has been measured to be 150 N/C downward at an altitude of 250 m and 165 N/C downward at an altitude of 400 m. Calculate the volume char
What is the magnitude of the uniform electric field between the plates? Find the change in the electric potential energy of an electron that moves from one accelerating plate to the other one.
When two tuning forks of 132 Hz and 146 Hz, respectively, are sounded simultaneously, how many beats per second are heard? Answer in units of beats/s.
Next, a beaker of water is placed so that the iron block, suspended as in part (A), is submerged in the beaker but not touching the bottom as seen in the picture. What mass is now necessary to balan
How much water flows over victoria falls which is 128 m high, at an average rate of 1.50 × 106 kg/s. the acceleration die to gravity is 9.81 m/s2.
The electrolysis of 0.250 L of a brine solution (NaCl) was carried out for a period of 20.00 min with a current of 2.00 A in an apparatus that prevented Cl2 from reacting with other products of the
Determine the magnitude of the spring's displacement at an instant when the acceleration of the box is zero. What is the magnitude of the spring's displacement when the spring is fully compressed?
How many grams of dry NH4Cl need to be added to 2.30L of a 0.300M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.85?
An alternating emf source with a variable frequency fd is connected in series with an 80.0 B resistor and a 40.0 mH inductor. The emf amplitude is 6.00 V. (a) Draw a phasor diagram for phasor VR
The angle between the beam and the cable is 90o. If the beam is inclined at an angle of q = 24.5o with respect to horizontal, what is the horizontal component of the force exerted by the hinge on th
A solid cylinder with a mass of x kg and a radius of x m starts from rest at a height of x m and rolls down a x degrees slope. what is the translational speed of the cylinder when it leaves the inc
Assuming all gases are at the same temperature and pressure, how many liters of carbon dioxide are produced from 15.0L of CO?
A father racing his son has three-fifths the kinetic energy of the son, who has three-fifths of the father. What is the original speed of the father?
A 25.0 ml sample of 0.200 M benzoic acid is mixed with a 100 m sample of 0.400M NH3. What is the PH of this solution.
An oscillator with a mass of 520 g and a period of 0.900 s has an amplitude that decreases by 2.50% during each complete oscillation. If the initial amplitude is 9.60 cm, what will be the amplitude
On a frictionless, horizontal air track, a glider oscillates at the end of an ideal spring of force constant 2.52 N/cm. The graph in the figure shows the acceleration of the glider as a function of
carbonate buffers are important in regulating PH of blood at 7.40. What is the concentration of CO2 in a 0.200M NaHCO3 at PH=7.40 ?
Kc=0.0420. The concentration of the products at equilibrium are [PCl3]=0.160 M, and [Cl2]=0.230 M. What is the concentration of the reactant PCl5 at equilibrium?
The displacement of a certain moving body is given by
An electron with an initial speed of 5.50×105 {rm{ m/s}} is brought to rest by an electric field. What was the potential difference that stopped the electron?
What is the emf of this cell when [Fe2+]= 1.5M , [Fe3+]= 1.8×10-2M , PO2= 0.47atm and the pH of the solution in the cathode compartment is 2.7?
A converging lens of focal length 7.92 cm is 24.1 cm to the left of a diverging lens of focal length -5.97 cm. A coin is placed 11.1 cm to the left of the converging lens. Calculate the location of
Three uniform thin rods, each of length L = 39 cm, form an inverted U. The vertical rods each have a mass of 15 g; the horizontal rod has a mass of 32 g. What are (a) the x coordinate and (b) the y