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The marrige rate (marriages per year) in the U.S. has been declining recently, w/ about 2e^-0.038t million marriages per year, where t is the number of years since 2010.
An RCL series circuit has a 18-ohm resistor, a 0.050-H inductor, and a 1.5x10-4 F capacitor. The generator has an rms voltage of 240 volts. What is the rms current in the circuit when the generator
A sample of neon occupies 105 liters at 27 degrees C under a pressure of 985 torr. What volume would it occupy at standard conditions?
The concentration of commercially available concentrated nitricacid is 70.0 percent by mass, or 15.9 M. Calculate the density of the solution.
When an 83.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.10 x 103 J. By how much does the potential energy of a 25.0
A 261-mL sample of a sugar solution containing 1.23 g of the sugarhas an osmotic pressure of 32.4 mm Hg at 36°C. What is the molar mass of the sugar?
Factor the polynomial function to determine the x intercepts and the y intercept. Enter all of the x-intercepts from smallest to largest.
A layer of diamond (n = 2.417) lies on top of a layer of sapphire (n = 1.797). What is the critical angle for total internal reflection between these two layers?
Write four equations showing structures for the reactions used in separating and recovering m-nitroaniline, benzoic acid, and naphthalene.
A horizontal wire that is 4.4 m long is exposed to a uniform external magnetic field of magnitude 79 mT (millitesla). The external field is directed at an angle of 39o below the horizontal. The magn
A circular coil of wire carries a current of 22 A. The radius of the loop is 9.0 cm, and the magnitude of the magnetic field at the center of the loop is 6.0 mT (millitesla). How many turns does the
Greg Nard added an equivalent of 3,4-epoxy-4-methylcyclohexanol to an ether solution of methyl magnesium bromide and then added dilute hydrocholoric acid. He expected that that the product wou
A one kilogram box of chocolates costs $0.90 less than twice the cost of a box of a 500g box. Two one kilogram boxes and three 500g boxes cost $34.60. Find the cost of one kilogram box.
A farsighted man has a contact lens prescription of +2.8 diopters, enabling him to see items in focus when they are no closer to his eyes than 28 cm. What is his near point when he is not wearing th
After scoring the game winning goal a player celebrates by dragging the 55kg goal around the rink. the player drags the goal form rest to 7m/s over a period of 3 seconds.
Benzene (C6H6) is often produced asa side product during Grignard reactions using phenylmagnesiumbromide. Explain how benzene's formation can be made. Alsowrite a balanced equation for this reactio
Let x and y be the number of litres of Laughter and Joy respectively that are produced per week. Calculate the maximum possible profit.
The vapor from an unknown volatile liquid occupies a269 mL Erlenmeyer flask at 98.7.C and 748 Torr. The mass of the capor is0.791g.
What would be the magnitude and direction of a vertical electric field that would just support the weight of (a) a proton near the Earth's surface, and (b) an electron near the Earth's surface?
An elevator cab that weighs 25.2 kN moves upward. What is the tension in the cable if the cab's speed is (a) increasing at a rate of 1.21 m/s2 and (b) decreasing at a rate of 1.21 m/s2?
A spaceship lifts off vertically from a planet where g = 7.0 m/s2. If the ship has an upward acceleration of 1.8 m/s2 as it lifts off, what is the magnitude of the force exerted by the ship on its pil
A 0.036 M aqueous nitrous acid(HNO2) solution has an osmotic pressure of 0.92 atm at 26°C.Calculate the percent ionization of the acid.
A 9.0 kg hanging weight is connected by a string over a pulley to a 5.0 kg block sliding on a flat table. If the coefficient of sliding friction is 0.20, find the tension in the string.
When 2.50grams of copper(Cu) reacts with oxygen, the copper oxide product has a mass of 2.81grams. what is the simplest formula of the copper oxide?
A 0.54·kg mass vibrates according to the equation x = 0.43 cos (8.44t + 2.91), where x is in meters, and t is in seconds. (a) Determine the amplitude (b) Determine the frequency. (c) Determine