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A charge q1 is inside a spherical surface (although not necessarily at the exact center of the sphere). A second charge q2 sits just outside the surface. Choose whether the following statements are
The pKa values for H2SeO3 at25o C are 2.64 and 8.27. Write the base-hydrolysis equilibrium equations forSeO32-(aq) andHSeO3-(aq)ions, and calculate the equilibrium constant values
Approximately what is the magnitude of the magnetic field of magnet A a distance of 0.36 m from the center of the magnet, along the same axis?
A very long wire carrying a conventional current of 3.9 amperes is straight except for a circular loop of radius 5.8 cm. Calculate the approximate magnitude and the direction of the magnetic field a
(a) A loop of wire carries a conventional current of 0.6 amperes. The radius of the loop is 0.06 m. Calculate the magnitude of the magnetic field at a distance of 0.37 m along the axis of the loop,
Calculate the pH of a solution preparedby mixing equal volumes of 20.0 M methylamine (CH3NH2 Kb = 3.7 *10^-4) and 0.60 M CH3NH3Cl.
A 5.5-kg block slides down a frictionless incline making an angle of 50.0° with the horizontal. (a) What is the total work done on the block when the block slides 1.6 m (measured along the incline
A tuning fork is sounded above a resonating tube(one end closed) which resonates at a length of 0.2m and again at 0.6m. What is the frequency of the fork when the speed of sound is taken to be 340m/
Two identical batteries, each with an emf of 18V, and an internal resistance of 1 Ohm, are wired in parallel by connecting their positive terminals together and connecting their negative terminals t
A) Copper contains 8.4 x 10^28 free electrons/m^3. A copper wire of cross-sectional area 7.4 x 10^-7 m^2 carries a current of 1 A. Find the electron drift speed.
14.0mg of a certain protein was dissolved in water to make asolution of 2.50mL at 28.0o C. If the osmotic pressureis 1.30torr, what is the molecular mass of the protein?
A pitcher hurls a 0.25kg ball around a vertical circular path of radius 0.6 m, applying a tangential force of 30N, before releasing it at the bottom of the circle (underhand pitch).
If the mass of the block is 0.167 kg and has an original speed of 0.70 m/s at a radius of 0.4 meters, what is the tension in the cord in the final situation at a radius of 0.2 meters when the block
Why do chemists prefer to read/record the absorbance, rather than the percent transmittance, of light (electromagnetic radiation) when analyzing a sample having a visible color?
Released from rest at the same height, a can of frozen juice rolls to the bottom of the same hill. What is the translational speed of the frozen juice can when it reaches the bottom?
What would be the freezing point of the solution if 175 g of sodium chloride (NaCl) is added to 1.00 kg of water? Kf of water is1.86 ºC·kg/mol.
Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the United States in one year is about 9.33 x 10^9 J.
A 1.526 g sample of a polymer dissolved in 1.00 L of a benzene solution at 22°C has an osmotic pressure of 4.52 x 10-2 atm. What is the molar mass of the polymer?
The same torque is applied to each sheet. The first sheet, starting from rest, reaches its final angular velocity in 7.4 s. How long does it take for the second sheet, starting from rest, to reach t
When a 35-N force is applied tangentially to the disk, perpendicular to the radius, the disk acquires an angular acceleration of 120 rad/s2. What is the mass of the disk?
When .514g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.8 degrees C to 29.4degrees C. Find delta E(rxn) for the combustion of biphenylin kJ/mol.
A CD has a mass of 17 g and a radius of 6.0 cm. When inserted into a player, the CD starts from rest and accelerates to an angular velocity of 25 rad/s in 0.67 s. Assuming the CD is a uniform solid
A 25.5g Al block is warmed to 65.4 degrees C and plunged into an insulated beaker containing 55.2g water initially @22.2 degrees C. The aluminum and water are allowed to come to thermal equilibrium.
Suppose you are riding a stationary exercise bicycle, and the electronic meter indicates that the wheel is rotating at 9.1 rad/s. The wheel has a radius of 0.35 m. If you ride the bike for 2060 s, h
Dana has a sports medal suspended by a long ribbon from her rearview mirror. As she accelerates onto the highway, she notices that the medal is hanging at an angle of 12^\circ from the vertical.