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A 200n roller is suspended freely by cord that passes over a frictionless pulley and is connected to a block that lies on a horizontal plane as shown the coeffiecient of static friction us between
A woman on a 10-speed bicycle travels at 9 m/s relative to the ground as she passes a little boy on a tricycle going in the opposite direction. If the boy is traveling at 1 m/s relative to the groun
What is the lift force exerted by the air on the rotors? What is the tension in the cable (ignore its mass) that connects the car to the helicopter?
Aspirin (acetylsalicylic acid) is a weak acid with a pKa of 3.4. Stomach acid has a pH of approximately 1.4. What is the approximate ratio of the protonated form of aspirin to the deprotonated form
Suppose 1.91 g of the vapor of a volatile liquid is able to fill a 408-mL flask at 100.4 degrees Celsius and 765 mmHG. What is the molar mass of the liquid?
A race car has a mass of 705 kg. It starts from rest and travels 41.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
Estimate the electric field at a point 2.40 cm perpendicular to the midpoint of a uniformly charged 2.00 m-long thin wire carrying a total charge of 4.60x10^-6
Ammonia (NH3) is widely used as a fertilizer and in many household cleaners. How much ammonia is produced when 7.8 mol of hydrogen gas react with an excess of nitrogen gas? Answer in units of mol
The acceleration of gravity is 9.8 m/s2 . If the object's speed reaches one-half its terminal speed in 3.048 s, determine the terminal speed.
Determine which reactant is oxidized, which reactant is reduced, which reactant is the oxidizing agent, and which reactant is the reducing agent.
Find the value of (theta) for which the reflection on the vertical surface of the paperweight exactly satisfies the condition for total internal reflection.
A tapered, pressurized tank for a rocket contains 0.250 m3 of kerosene, which has a mass of 205 kg. The pressure at the top of the kerosene is 2.01 x 105 Pa. The pressure force of 18.0 kN on the ta
It will be traveling with speed 197 m/s. We have a large and powerful spring whose stiffness is 2.5x10^5 N/m. How much must we compress the spring?
Two skaters that are initially at rest push off from one another. One has a mass of 50 kg and moves with a speed of 4.0 m/s to the right after pushing off. What is the velocity of the other skater w
The A string of a violin is 32 cm long between fixed points with a fundamental frequency of 440 Hz and a mass per unit length of 6.5×10-4 kg/m. What are the wave speed in the string?
What is the pH of a solution which is 0.023 M in weak base and 0.035 M in the conjugate weak acid (Ka = 7.1 × 10-6)?
Because of the cramped space under the hood, you'll need to pull at an angle of 115^circ with respect to the wrench shaft. With what force must you pull?
A 65 kg swimmer jumps off a 10 m tower. The swimmer comes to a strop 2.0 m below the surface. What is the net force exerted by the water
What kind of kinetics does this enzyme follow: rapid equilibrium or just the general steady state? Justify your answer.
Assuming that all of the fuel is used, find the final speed of the last portion of the ejected fuel relative to a stationary observer. Please provide step-by-step method.
What are the magnitude and direction of the impulse of the net force applied to the ball during the collision with the floor?
A force of 5.3 N is needed to hold on to an umbrella in a strong wind. If the air molecules each have a mass of 4.7 × 10-26 kg, and each strikes the umbrella (without rebounding) with a speed
A 65.5 kg circus performer slides 4.15 m down a pole to the circus floor, starting from rest. (b) What is her kinetic energy when the frictional force has a magnitude of 520 N?
The vapor pressure of water is 28.3 torr at 29°C if a reaction at that temperature produces CO2 which is collected over water at a total pressure of 576 torr, what is the partial pressure of oxy
The disk has a mass of 200 kg and a radius of 2.0 m. A 42- kg child rides at the center of the merry-go-round while a playmate sets it turning at 0.10rpm. How fast will the disk be turning (in rpm)?