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A boat moves through a river at 8.0 m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 3.0 m/s, how long does it take the boat to make a rou
acetylene can be made by reacting calcium carbide with water what's the maximum amount of heat that can be obtained from the combustion of acetylene starting with 74.6 g of CaCo2
A physiological saline solution contains 161 mEq/L each of Na+and Cl- , How many moles each of Na+ and Cl- are in 0.700 of the saline solution?
the pump driving the water feature is located 175 ft away (laterally) and is to be installed in a pit 15 ft deep (below grade) what must the pressure be at the pump discharge.
A 0.30 kg softball has a velocity of 12 m/s at an angle of 35° below the horizontal just before making contact with the bat. The ball leaves the bat 2.0 ms later with a vertical velocity of magn
The flask was then shaken until the solution was uniform. A 50.0 rm mL sample of this glucose solution was diluted to 0.500 rm L. How many grams of glucose are in 100. rm mL of the final solution?
A tank of water sits at the edge of a table of height 2.2 m. The tank springs a very small leak at its base, and water sprays out a distance of 2.0 m from the edge of the table. What is the water l
A sample of a bright blue mineral was weighed in air, then weighed again while suspended in water. An object is buoyed up by the mass of the fluid displaced by the object. In air, the mineral weighe
A golfer can hit a golf ball a horizontal distance of over 300 m on a good drive. What maximum height will a 301.5 m drive reach if it is launched at an angle of 25.0 degrees to the ground?
A certain reaction has the following general form.Determine the value of the rate constant for this reaction. Calculate the half-life for this reaction.
A 74 kg diver steps off a 14 m tower and drops from rest straight down into the water. If he comes to rest 4.4 m beneath the surface, determine the average resistance force exerted on him by the wate
For the reaction Ag2S(s) > 2Ag+ (aq) + S2- (aq) what happens to the equilibrium position if ammonium sulfide is doubled ?
What is the rms speed of nitrogen molecules contained in an 7.6 m^3 volume at 2.2 atm if the total amount of nitrogen is 1200 mol?
A person pulls on a 50 kg desk with a 200N force acting at a 30 degree angle above the horizontal. The desk does not budge. Draw a force diagram for the desk.
3 Zn(s) + 2 Bi3+(aq) → 3 Zn2+(aq) + 2 Bi(s) What is the standard reaction free energy? Faraday's constant is 96485 C/mol. Answer in units of kJ/mol
Determine the angular speed of the minute hand and the hour hand of a clock(in radians per minute).
A gas expands and does P-V work on the surroundings equal to 3.2x10^2 J. At the same time, it absorbs 111 J of heat from the surroundings. Calculate the change in energy of the gas.
During backwashing process of a softener tank, resin in the tank is regenerated using brine solution. The Reynolds's number in the tank is needed to be maintained in a range of 4500 to 5500 for effe
An 8.0 m, 300 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.55, and the ladder makes a 50.0° angle with the ground. How
when 0.60 mol of gas x and 0.40 mol of gas y react in a 2.0 l container tp produce z, an equilibrium is reached in which (z) is found to 0.80 mol/l. The reaction is x(g) + 2y(g)=2z(g). Calculate the
The 15 head of a bobble-head doll oscillates in SHM at a frequency of 4.0Hz . The amplitude of the head's oscillations decreases to 0.50 in 4.0. What is the head's time constant?
A 2.98 kg block initially at rest is pulled to the right along a horizontal surface by a constant, horizontal force of 19.8 N. The coefficient of kinetic friction is 0.11. The acceleration of gravi
He was surprised that most of the white solid melted sharply between 121 and 122oC but that a small amount remained unmelted even at temperatures above 200oC. Explain this behavior.
What is the radius of an automobile tire that turns with a frequency of 8 Hz and has a linear speed of 26 m/s?
Andy, age 16, lacks self-discipline, fails to plan ahead, and is quickly frustrated by challenging tasks. He is anxious and overly critical of others. Use the psychoanalytic, humanistic and social-