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A security camera is mounted 9 feet above the floor. What angle of depression should be used if the camera is to be directed to a spot 6 feet above the floor and 12 feet from the wall?
The height is 30 cm.The trough is not full. Give an expression for V, thevolume of water in the trough in cm3, when the depth of the water is d cm.
You need to produce a buffer solution that has a pH of 5.23. You already have a solution that contains 10 mmol (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acet
The mass of a proton is 1.007825 amu and the mass of a neutron is 1.008665 amu. What is the nuclear binding energy of 1 atom of 210Bi, which has a mass of 209.9891 amu?
The far point of an eye is 190 cm. A corrective lens is to be used to allow this eye to focus clearly on objects a great distance away. What should be the focal length of the lens?
Any change in the volume of the solution due to the addition of solid potassium formate is insignificant. (Ka for HCOOH = 1.8 x 10^-4)
A railroad engine weighs three times as much as a freight car. If the engine coasts at 9 km per hour into a freight car that is initially at rest, how fast do the two coast after they couple toge
A saturated solution of silver chromate (Ag2CrO4) was found to have a CrO4^2- ion concentrate of 3.2*10^-4 M at 25 degrees C.How could you increase the solubility of the salt?
An olive is at the bottom of a glass of alcohol (n = 1.36), 5.21 cm beneath the surface. Above the alcohol is air. To a person in the air, who is directly above the olive, what is the apparent de
You have a 5M stock solution of sodium hydroxide. Your supervisor tells you to make up 1 liter of a 1M solution of sodium hydroxide for an experiment she needs for an experiment. How would you make
If the eyepiece has a magnification of 20 and the total magnification of the microscope is |m| = 110, what is the focal length of the objective lens?
Consider a refracting telescope with an objective lens of focal length fobj = 1.4 m and an eyepiece with focal length feyepiece = 7 cm. What is the angular magnification of this telescope?
Why are much larger quantities of AlCl3 required for Friedel-Crafts acylation reactions than for alkylation reactions?
The magnifications produced by the mirrors are mA = 4.0 and mB = 1.7. Find the ratio fA/fB of the focal lengths of the mirrors.
Give the complete mechanism for the formation of dibenzalacetone, starting from benzaldehyde and acetone. Make sure to show the flow of elections by using curved arrows, as well as all charges and l
If your usual weight is 180 lbs and you are in an elevator, which is going up and speeding at a rate of 8 ft/s2, what will your apparent weight be in lbs?
NH4NO3 decomposes according to the equation...What pressure, in torr, will develop in a 50 mL container at 800 Celsius if 34.5g of NH4NO3 decomposes?
If the diameter of the globe is 18cm, where is the image of the person, relative to the surface of the globe?. How large is the person's image?
Question: Technetium-99 is widely used to diagnosis in medicine. Its half-life is 6.02 hours. A sample prepared in the early morning for use that day had an activity of 4.59 ?Ci. What will its activ
A gas sample is heated from -20.0oC to 57.0oC and the volume increased from 2.00L to 4.50L. If the initial pressure is 0.126 atm, what is the final pressure?
If a container is composed of H2, N2, and O2 gas with the partial pressures being .146 and .572, respectively, what is the partial pressure of O2?
Predict whether or not a precipitate will form upon mixing 75.0 ml of a NaOH solution with pOH=2.58 with 125.0ml of a 0.018 M MgCl2 solution. Identify the precipitate, if any.
Photoionization of a diatomic molecule produces a singly charged cation. For the molecules NO, calculate the bond order of the neutral molecule and the lowest energy cation.
One of the allotropes of sulfur is the orthorhombic form, formula S8 (8 is a subscript), which is a brittle, yellow solid. It does not conduct electricity. this form is stable below 94.5 deg C. It d
Determine the pH of the solution formed when 500.00 mL of 2.35 x 10-3 M tetrodotoxin is mixed with 500.00 mL of 2.00 x 10-6 M HCl. Tetrodotoxin (HC11H16N3O8) is a weak monoprotic having a Ka = 1.7*10-