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A farsighted person has a near point of 60.0 cm for the left ye and a near point of 90.0 cm for the right eye. What power should contact lenses have to allow the person
An astronomical telescope uses an eyepiece of power +100.0 D. what are the power of the objective and the magnifcation of the telescope
A student adds 33.0045g of potassium acetate to water and then adds 7.0 ml of 1.0 M HCl to this . the resulting solution is diluted to 250.0 ml calculate the PH of the resulting solution.
to combat wasteful habits we often speak of "conserving engery", by which we mean turning off lights, find the difference in energy conservation and conserving energy
The decomposition of ammonia is 2NH3(g) = N2(g) + 3H2(g). If Kp is 1.5x10^3 at 400 degrees C, what is the partial pressure of ammonia at equilibrium when N2 is 0.10 atm and H2 is 0.15 atm
A circuit consists of two 475-k%u03A9 resistors in series with an ideal 12.0-V battery. Calculate the potential drop across one of the resistors
Net ionic equation for 2CH3COOH(aq)+ Sr(OH)2(aq)----> Sr(CH3COO)2(aq)+2H2O(l) Here's the hint the question came with: (hopefully this means something to you) - what are the two products of a neu
A string %uFB01xed %uFB01xed at both ends is 1 m long. It resonates in its second harmonic at a frequency of 55 Hz. What is the speed of transverse waves on the string
Pure tungsten melts at 3370 C . The liquid has a vapor pressure of 5 torr at 4337 C and of 60 torr at 5007 C calculate the normal boiling point of tungsten.
A violin string that is 57.8 cm long has a fundamental frequency of 350 Hz. What is the speed of the waves on this string
The result described is impossible, given the fact that delta G is -60 kJ/mol. d. The activation energy for the reaction is very large; equilibrium has not been reached by 24 hours. e. An enzyme has
A block of unknown mass is attached to a spring of spring constant 7.9 N/m and undergoes simple harmonic motion with an amplitude of 13.2 cm. Calculate the mass of the block
A 0.377 kg mass is attached to a spring and undergoes simple harmonic motion with a period of 0.57 s. The total energy of the system is 3 J
A 45.3 g mass is attached to a horizontal spring with a spring constant of 14 N/m and released from rest with an amplitude of 37.2 cm. What is the velocity of the mass
When a mass of 25 g is attached to a certain spring, it makes 19 complete vibrations in 4.5 s. What is the spring constant of the spring
The equilibrium contant Kc for the reaction HF(aq)+H20(l)-->H30+(aq)+F-(aq) is 3.5x10^-4. What is the equilibrium concentraction of H30+ if the initial concentration of HF is 1.0M
Determine the acid dissociation contant for a 0.10M acetic acid solution that has a pH of 2.87. Acetic acid is weak monoprotic acid.
Whats the reduced mass of CO2. I know how to do it for CO but since its 3 molecules do you go m1+m2+m3/m1m2m3 or is m2 just 32
Calculate the expected change in temperature for 1.7 g of NH4NO3 dissolved in 50.0 mL of H2O. Assume that the calorimeter absorbs no heat.
What is the hydronium ion concentration of a 0.100 M hypo hpyochlorous acid solution with Ka=3.5x10^-8? Given the equation for the dissociation of hypochlorous acid.
The rms current in a 46-%u03A9 resistor is 0.34 A. What is the peak value of the voltage across this resistor
A 7.28-%u03A9 resistor is connected across a 9.00-V battery. The voltage between the terminals of the battery is observed to be only 7.27 V. obtain the internal resistance of the battery
What are some factors to help you determine the relative strength of a base. For example, how would you know that NH2- is a very strong base. Or that OH- is a weaker base than NH2- And that CN- is a
solid disk of radius 4.05 cm and angular velocity of 81.32 rad/s about an axis through its center perpendicular to its plane. How far (in cm) will the disk travel until it stops skidding
Two solenoids of radii 2 cm and 5 cm are coaxial. They are each 25 cm long and have 380 and 960 turns, respectively. Find their mutual inductance in mH