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Ball flies 50 yards in this direction, before it is caught. What is the total distance between were the ball was initially spotted and were it was caught? Write down x and y components of each vecto
A solution of a monoprotic acid, HA, at equilibrium is found tohave a 0.0208 M concentration of nonionized acid. the pH of theacid solution is 2.17. Calculate the initial acid concentration and Ka&n
A 0.700-V potential difference is maintained across a 1.50-m length of tungsten wire that has a cross-sectional area of 0.500 mm2. What is the current in the wire?
Calculate the rate at which internal energy is produced in 1.95 m of 12-gauge copper wire carrying a current of 20.0 A.
What are the boiling point and freezing point of a 2.47m solutionof naphthalene in benzene? (The boiling point and freezingpoint of benzene are 80.1oC and 5.5oC,respectively).
A 120-V motor has mechanical power output of 3.20 hp. It is 91.0% efficient in converting power that it takes in by electrical transmission into mechanical power. (a) Find the current in the motor.
Despite the fact that almost all physicians no longer recommend that children not be given aspirin because of fears of triggering Reye's syndrome, 'baby' aspirin sales have remained strong. Suggest
The current decreases as the heating element warms up. When the toaster reaches its final operating temperature, the current is 1.51 A. (a) Find the power delivered to the toaster when it is at its
A car owner forgets to turn off the headlights of his car while it is parked in his garage. If the 12.0-V battery in his car is rated at 140.0 A · h and each headlight requires 24.0 W of powe
A rectangle has been measured to have sides (in cm) 23.42, 24.25, 13.11, 13.42, each with uncertainty 0.05 cm. Calculate, with uncertainty, the perimeter and area of this rectangle.
Sr-90 has a half-life of 29.1 years. How long will it take forthe activity of a Sr-90 sample to decay from 6.5x10^3 dpm(disintergration per minute) to 3x10^2 dpm?
Using the Earth as the frame of reference, how many feet does the bottle travel between the moment it falls off the cart, and when it hits the airplane's deck? Report your answer to the nearest thre
Oxygen is dissolved in water at a concentration of 0.695g/L at a pressure of 13.5atm at 25degrees C. What is the Henry's Law constant for oxygen?
By how much does the ball clear or fall short of clearing the crossbar? What is the vertical velocity of the ball at the time it reaches the crossbar?
Determine the electric field at a location which is at the middle of the stick but 1 cm away from the stick. That is at the 50 cm point, 1 cm away from the stick.
The iron(III) chloride does not react with hydrochloric acid. When the 5.000g mixture is reacted with excess hydrochloric acid,420.25 mL of hydrogen sulfide gas is collected, measured at18.6 degree
A meter stick is charged with 20 micro Coulombs by placing it on a Van de Graff generator. Assume that the charge is distributed evenly along the stick. Determine the electric field at a location wh
Two positive point charges Q1 = 16 micro Coulombs and Q2 = 4 micro Coulombs are seperated in a line by a distance of 3 meters. Find the spot on the line bewteen the charges where the electric field
Consider an XY plane with charges located at the following points: Q1 is located at X=0, Y=0 and has a magnitude of 4 micro Coulombs Q2 is located at X=0.1 meter, Y = 0 meters with charge -5 micro C
The standard enthalpies of formation for CO2 (g) and water(l) are -393.5 KJ/mol and -285.8 KJ/mol respectively. The enthalpyof combustion of CH4 (enthalpy of formation = -74.6 KJ/mol) is(KJ/mol)
In reacting aluminum carbonate with hydrochloric acid, 57.6 mgof carbon dioxide was formed. What is the mass of aluminum carbonate reacted to form this amount of carbon dioxide?Al2(CO3)3+ 6HCl ->
Pure Ag melts at 961.8 degC and boils at 2162 degC. The heat of fusion for Ag is 11.28kJ per mol and the heat of vaporization is250.6kJ per mol. Calculate the entropy change for Ag from 961.7 degC t
Consider a 1g sample of radioactive Californium, Z=98 and A=245. The half life of this isotope is 45 min. On average, how many disintegrations per sec occur for this isotope?
Calculate the rms speed of a carbon dioxide molecule at 25°C.
A 72-kg sprinter accelerates from rest to a speed of 11.0 m/s in 5.7 s. (a) Calculate the mechanical work done by the sprinter during this time.