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On a hot summer day, the temperature of air in Arizona reaches 113°F. What is the speed of sound in air at this temperature? (Enter your answer to four significant figures. The speed of sound at
An electron traveling at 993 m/s enters a 1.5 T magnetic field. The angle between the velocity and the field is 90o. Find the radius of the resulting circular path.
2.55g napthalene dissolved in 30g of benzene. benzene freezes at 5.5C and resulting solution freezes at 2.13C what is the freezing point depression constant of benzene.
An electron is accelerated through a potential difference of 400V. Find its wavelength and momentum.
The density of toluene (C7H8) is 0.867 g/mL, and the density of thiophene (C4H4S) is 1.065 g/mL. A solution is made by dissolving 23.0 g of thiophene in 250.0 mL of toluene.
Find the velocity of the most energetic electron emitted from the cathode when the incident light on the cathode is 100nm.
A solution of water kf=1.86 and glucose freezes at 1.75C. What is the molal concentration of glucose in this solution? Assume that the freezing point of pure water is 0.00 C.
How much heat must a refrigerator remove from 100 g of water at 25 º C to convert it to ice at 0º C? (Specific heat of water = 1 cal /gº C and heat of fusion of ice = 80 cal/g at 0&or
Isotonic saline solution, which has the same osomotic pressure as blood, can be prepared by dissolving 0.923 g of NaCl in enough water to produce 100. mL of solution
A wire carrying a current is shaped in the form of a circular loop of radius 3.0 mm. If the magnetic field strength at its center is 1.1 mT with no external magnetic fields contributing to it, what
The normal boiling point of benzene is 80.1 C (Celsius) and the heat of vaporization is Hvap = 30.7 kJ/mole. What is the boiling point of benzene in C on top of Mt. Everest, where P (pressure) =
Which of the following equations represents the proper net ionic equation for the complete neutralization reaction between the strong base Ba(OH)2 (aq) and the weak acid H2S (aq)?
A young hockey player stands at rest on the ice holding a 1.3-kg helmet. The player tosses the helmet with a speed of 4.6 m/s in a direction 9° above the horizontal, and recoils with a speed of
The transverse displacement of a particular wave on a string is given by: D(x,t) = 0.3 cos(1.57x ? 7.85t) where D and x are in meters, and t is in seconds. For this wave, find its:
A typical nuclear fission power plant produces about 1.00 GW of electrical power. Assume the plant has an overall efficiency of 42.0% and each fission produces 150 MeV of thermal energy. Calculate the
Its density is 3000 kg/m3 and the unit cell volume is 5.00 x 10-23 cm3. Calculate the molar mass (g/mol) of the element to three significant figures.
The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 2.50 10-11 W/m2. What is the intensity delivered to the eardrum?
A certain substance X decomposes. It is found that 50% of X remains after 100 minutes. How much X remains after 200 minutes if the reaction order with respect to X is zero order?
For a certain transverse wave, the distance between two successive crests is 1.20 m, and eight crests pass a given point along the direction of travel every 12.0 s. Calculate the wave speed.
How many milliters of boiling water are required to dissolve 20 grams of phthalic acid? If the solution is cooled to 14oC, How many grams of phthalic acid would recrystallize out?
A virtual image is located 53.5cm behind a concave mirror with focal length 20.0cm. Where is the distance from the mirror to the object?
A camera's zoom lens covers the focal-length range 38mm -138mm. You point the camera at a distant object and photograph it first at 38mm and then with the camera zoomed out to 138mm. Compare the si
The temperature of the mixture is 0? , and the total pressure is 1.00 atm. How many grams of helium are present in the gas mixture?
A rifle of 8lb fires a bullet weighing 0.8oz which leaves the rifle with a muzzle velocity of 2000 ft/s. What is the recoil velocity of the rifle?
Calculate q if the temperature of a 1.00 kg water bath in the surroundings increases by 1.25 Celsius degree. Assume that the surroundings are at constant pressure.