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A train horn is heard at a 50 dB level by an observer 10 km away. What is the average power generated by the horn
A bartender slides a beer mug at 1.5 m/s towards a customer at the end of a frictionless bar that is 1.2m tall. how far way from the end of the bar does the mug hit
A projectile is launched with initial speed of 60 m/s at an angle of 30 degrees above horizontal. the projectile lands on hillside 4 seconds later. what is velocity at the highest point of trajector
Determine the size of their product and multiply them, if possible. If the matrix multiplication is not possible, use their sizes to explain why not.
The reaction for the decomposition of dinitrogen monoxide gas to form an oxygen radical is: N2O--->N2 + O2. If the activation energy is 250 kj/mol and the frequency factor is 8.0 x 10^11 s^-1, wh
A spacecraft has a nonrelativistic (or classical) momentum whose magnitude is 1.3e14 kg · m/s. Find the relativistic momentum of the spacecraft
The concentration of SO42- (aq) in a sample of river water can be determined using a precipitation titration in which a salt of Ba+ (aq) is the standard solution and BaSO4 (s) is the precipitate for
If the hypotenuse of a right triangle is 6.00cm long, and the opposite is 4.00. What is the angle facing the opposite
Will a precipitate form when a solution of sodium acetate and a solution of ammonium sulfate mix and what is the net ionic equation that describes the chemical change. what about for a solution of c
15. An object weighing 300 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 265 N. find the density of the object
If the 4.00g sample corresponds to 0.0666 moles of a compound, what is the molecular formula of the unknown molecule (CxHyOz)
A sample of 24.0 g of helium (He, M = 4.00 g/mol) has a temperature of T = 108 K and a pressure of 2.86 atm. Assuimg the this sample follows the perfect gas law, determine the volume it occupies.
the freezing point of the solution is 5.144 degrees celcius. Pure benzene freezes at 5.444 degrees celcius and has a Kf of 5.12 degrees celcius/m. What is the molar mass of thyroxine
what are the concentrations of the significant ionic species of a 0.100M solution of lysine at pH=4
A liquid (p = 1.35 g/cm3) flows through two horizontal sections of tubing joined end to end. Calculate flow speed and pressure in the smaller section
The vapor pressure of water at 45.0 degrees celcius is 71.93 mmHg. Calculate the vapor pressure of a solution of 1.50m K2CO3 at this temperature (assume 100% dissociation)
Look up the chemical compound that is methiocarb and describe briefly its chemistry and its pharmacology and what effects does Methiocarb have on the mammalian body? What other signs/symptoms would J
A standing wave is set up in a 200-cm string fixed at both ends. The string vibrates in 5 distinct segments when driven by a 120-Hz source. What is the fundamental frequency for the string
A small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, What is the weight of the truck
Gold has cubic crystals whose unit cell has an edge length of 407.9 pm. The density of the metal is 19.3 g/cm3. Calculate the number of gold atoms in a unit cell. What type of cubi lattice does gold
If 20.g of NaCl are used, how many grams of H2SO4 are required for complete reaction? Using the balance equation 2NaCl(s)+ 1H2SO4(aq)= 2HCl(aq)+ 1Na2SO4
A ball is thrown from a window with Vo=2m.s at an angle of 53 degrees ABOVE the horizontal. From what height was the ball thrown
Write a balanced (a) molecular, (b) overall ionic, and (c) net ionic equation for the reaction between an aqueous solution of phosphoric acid, H3PO4 (aq) , and an aqueous solution of sodium hydroxid
A man stands on a platform that is rotating (without friction) with an angular speed of 1.8 rev/s; what is the resulting angular speed of the platform
The boyle temperature is the temperature at which the coefficient b is zero. Therefore, a real gas behaves like an ideal gas at this temperature. (a) Give a physical interpretation of this behavior.