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A 9000 kg railroad car is moving at 3m/s strikes a stationary (not moving) 5000 kg railroad car. if the two rail road cars couple and move off together after the collision, what is their velocity?
Calculate the percentage of empty space in 1 mol of water at 25C. Obtain the density from the experiment " Some Measurements of Mass and Volume."
A stone is thrown with an initial speed of 10.6 m/s at an angle of 52 degrees above the horizontal from the top of a 30 m building. If air resistance is negligible, then what is the magnitude of the
What is the equilibrium partial pressure (in atm) of H2S if a solid sample of NH4HS is placed in a closed container and allowed to reach equilibrium at 295 K.
In addition, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57. Find the acceleration of the sled and child.
The male figure is 180 cm tall, the female 168 cm. Normalize the displacements of each figure to a common height of 200 cm, and re-form the vector sums as in part (a). Then find the vector differen
How many liters of ammonia gas can be formed from the reaction of 150 L of hydrogen gas? Assume that there is complete reaction of hydrogen gas with nitrogen gas.
A 214-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 31.0° with respect to the horizontal. The coefficient of kinetic frictio
Calculate the hydronium ion concentration and the pH after the addition of 0.25 mL of 0.10 M HCl to each one. What accounts for the difference in the hydronium ion concentrations?
The resultant displacement A+B has a magnitude of 3.75 km. What is the magnitude of B, and what is the direction of A+B relative to due south?
Consider the reaction CO(g) + 2H2(g) CH3OH(l) at 25°C. Calculate value of the equilibrium constant (Kp) for this reaction at 25°C.
An oxygen gas tank has a volume of 8 L and a pressure of 1500 N/m2. If the temperature decreases from 2500 K to 2000 K and its volume increases to 24 L, what is its final pressure?
A tennis player places a 56 kg ball machine on a frictionless surface. the machine fires a 0.055 kg tennis ball horizontally with a velocity of 43 m/s toward north. what is the final velocity of the
The Arrhenius equation, k = Ae-E/RT expresses the relationship between the reaction rate constant, k, and the energy of activation, E. The probability that colliding molecules will react?
An empty flask has a mass of 123.4 g. When the flask is filled with water, the mass is 211.6 g. If 10.0 g of zinc (d = 7.14 g/cm3) are added to the flask filled with water (and the sides of the fla
Which concentration is consistent with a basic solution?
What is the molarity of a solution when 2.25 g NaF is dissolved in enough water to make 250.0 mL of solution?
How many 101 W lightbulbs can you use in a 120 V circuit without tripping a 13 A circuit breaker? (The bulbs are connected in parallel, which means that the potential difference across each lightbul
Two stationary positive point charges, charge 1 of magnitude 4.00 nC and charge 2 of magnitude 1.80 nC , are separated by a distance of 44.0 cm. An electron is released from rest at the point midway
What mass of ethanol, C2H5OH (a non-electrolyte), must be added to 10.0 L of water to obtain a solution that freezes at -10 ° C? Assuming that the density of water is 1.0 g / mL.
If Kb for NX3 is 6.5 x 10-6, what is the percent ionization of a 0.325 M aqueous solution of NX3?
What is the electric potential at this point? Express your answer to two significant figures and include the appropriate units.
Arrange the following bonds in order of increasing bond strength.
Find % dissociation and pH of a solution that is 1.0 M acetic acid and 1.0 M sodium acetate. Find the pH of 0.75 M lactic acid and 0.25 M sodium lactate (Ka = 1.4 x 10-4)