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the near point of a person's eye is 52.8 cm. To see objects clearly at a distance of 24.0 cm, what should be the focal length and power of the appropriate corrective lens
Phosphoric acid reacts with magnesium hydroxide to produce magnesium phosphate and water via the following reaction: ?H3PO4 + ?Mg(OH)2->?Mg3(PO4)2 + ?H2O
The density at 20 degrees celsius of a 0.500 M solution of acetic acid in water in 1.0042 g/mL. what is the molality of the solution? the molar mass of acetic acide, CH3CO2H is 60.05 g
A rectagular boat is overloaded so that the water level (in fresh wateer) is just one centimeter (1.0cm) below the top of the boat, what is combined mass of all the people and the boat combined
has a standard free-energy change of -4.00 kJ/mol at 25 °C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40
The average distance of the planet Mercury from the sun is 0.39 times the average distance of the earth from the sun
Ionization energy is the energy needed to eject an electron from an atom. Compute the ionization energy of a hydrogen atom in its first excited stat (n=2)
A sprinter of mass 63.7 kg runs at a constant speed of 10.8 m/s in a straight line. Find the extra force the sprinter must exert on the ground
a line in the Balmer series of hydrogen has a wavelength of 434 nm from what state did the electron originate
A small package rests on the horizontal dashboard of a car. If ?s = 0.302, what is the minimum acceleration of the car
what mass in grams of a 0.5 m solution of sodium acetate in water would you use to obtain 0.150 mol of sodium acetate
Two blocks, each of mass m = 1.4 kg, are pushed along the horizontal surface of a table by a horizontal force P of magnitude 4.7 N, Find the frictional force acting on the upper block
A cube made of steel 0.300 meters on a side is suspended from a scale until it is completely immersed in fresh water
Calculate the energy of a photon emitted an electron in a hydrogen atom undergoes a transition from n=3 to n=1
A sonar echo returns to a submarine 1.40 s after being emitted. What is the distance to the object creating the echo
Determine the molecular formula for the unknown if the molecular mass is 60.0 amu and the empirical formula is CH2O.
A wooden block weighing 7 N is at rest on top of a wooden desk. The coefficient of static friction between the block, Find the minimum horizontal force required to move the block
consider a hydrogen atom in the ground state. what is the energy of its electron? Now consider an excited- state hydrogen atom. what is the energy of the electron in the n=2 level
A custom car built for pretentious people has two brass horns that are supposed to produce the same frequency, What beat frequency is produced
To resolve an object in an electron microscope the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein
Calculate the force on an airplane which has acquired a net charge of 1450?C and moves with a speed of 150m/s perpendicular to the Earth's magnetic field
A 3 kg block slides along a frictionless surface at 1.0 m/s. A second block, sliding at a faster 5.0 m/s, What is the mass of the second block
The blood buffering system is aided by the enzyme carbonic anhydrase, which interconverts carbon dioxide and water to bicarbonate and H
A 62.0 m length of insulated copper wire is wound to form a solenoid of radius 2.1 cm. The copper wire has a radius of 0.53 mm. How long is the resulting solenoid
What is the empirical formula of a substance that contains 0.183 mol of carbon, 0.367 mol of hydrogen, and 0.183 mol of oxygen