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If the blocks move determine the magnitude of the tension in the string. If the blocks do not move determine the sum of the magnitude of the forces of friction acting on the blocks. Show all work.
By adding Hg to the tube he increase the pressure on the trapped air to 2.64atm. assuming constant temperature, what is the new volume of air?
If we place the origin in the nest and extend the +x-axis to the release point, what was the bird's average velocity for the return flight? (m/s). What was the bird's average velocity in {rm m/s} fo
Three uniform thin rods, each of length L = 35 cm, form an inverted U. The vertical rods each have a mass of 18 g; the horizontal rod has a mass of 35 g. What are (a) the x coordinate and (b) the y
The temperature of the solution went up to 29degrees C. If calorimeter constant is 11 cal/deg C, find delta H for the solution of one mole of NaOH in H2O.
The CaC2O4-H2O precipitate is not completely air-dried when its mass is determined. Will the reported mass of the limiting reactant in the original salt mixture be reported too high or too low? Explai
A chair of weight 105 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 35.0 directed at an angle of 43.0 below the horizontal and the chair slides
Iron has a density of 7.87 g/cm3, and the mass of an iron atom is 9.27 × 10-26 kg. If the atoms are spherical and tightly packed, (a) what is the volume of an iron atom and (b) what is the di
Kc = 3.59 at 900 °C. For each of the following measured concentrations determine whether the reaction is at equilibrium. If not at equilibrium, in which direction will the reaction proceed to ge
An empty freight car of mass M starts from rest under an applied force P. At the same time, sand begins to run into the car at steady rate b from a hopper at rest along the track. Find the speed whe
A spring with 55 hangs vertically next to a ruler. The end of the spring is next to the 20- mark on the ruler.If a 3.0- mass is now attached to the end of the spring, where will the end of the sprin
How many carbon atoms are in the empirical formula? How many hydrogen atoms are in the empirical formula? How many oxygen atoms are in the empirical formula?
If 2.0 g of salicylic acid are reacted with 5.0 mL of acetic anhydride in the presence of an acid catalyst, what is the theoretical yield of aspirin in grams? (just enter a number, no units)
A stone with a mass of 0.900kg is attached to one end of a string 0.900 m long. The string will break if its tension exceeds 60.0 N . The stone is whirled in a horizontal circle on a frictionless ta
The density of so-called "heavy water" at 20.0C is 1.1053 g/mL. What will the mass of the flask be when filled with heavy water at 20.0OC?
A 4.0- sled with ropes, as indicated in the figure . Both teenagers pull with a force of 55 at an angle of 35 relative to the forward direction, which is the direction of motion. In addition, the sn
A small piece of dust of mass m = 2 g travels horizontally through an electric air cleaner in which the electric field is 545 N/C. The electric force on the particle is equal to the weight of the p
Why was Benedict's solution used instead of biuret test solution to confirm the identity of sucrase obtained in the experiment?
Assume complete combustion. STP conditions can be assumed for the O2 gas consumed in this problem (1mol = 22.4 L - This equality can only be used for substances in the gaseous state).
The bullet first passes through the left disk and then through the right disk. It is found that the angular displacement between the two bullet holes is θ = 0.320 rad. From these data, determi
Assume that one of the pumps uses a ¼ hp DC shunt motor with an input voltage of 115 VDC that pulls 1.6 A running at 1,500 rpm. The field resistance for the motor is 600 Ω and the arma
In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 112 kJ is given off per mole of C2H4 reacting, how much heat is released when 15.7 kg of C2H6 forms?
We have an aqueous solution that contains 41% (by mass) of a hypothetical solute Z. The formula weight of the solute Z is 96 g/mol. The density of the solution is observed to be 1.2 g/mL. What is th
A 1.27-kg block slides across a rough surface such that it slows down with an acceleration of 1.40 m/s2. What is the coefficient of kinetic friction between the block and the surface?
Starting from rest at the top, a child slides down the water slide at a swimming pool and enters the water at a final speed of 5.95 m/s. At what final speed would the child enter the water if the wa