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A 25.0 mL sample of 0.125 molL-1pyridine (Kb=1.7×10-9)is titrated with 0.100 molL-1HCl.
Calculate the pH at 10 mL of added acid. Express your answer using two decimal places.
Calculate the pH at 40 mL of added acid. Express your answer using two decimal places.
What is the tension in the connecting string if all surfaces are frictionless and the mass of the pulley is negligible?
A box of well called as breakfast cereal states that one small portion of the cereal contains 110 Calories (1 Cal = 4186 J). If 2.0 percent of this energy could be converted by a weight lifters body into work completed in lifting a barbell.
A circular coil of 70 turns and a radius of 5 cm is placed with its plane oriented at 90 degrees to a magnetic field of 0.1 T. The field is now increased at a steady rate, reaching a value of 0.7 T after 2 seconds. What EMF is induced in the coil?
A sewing machine needle moves up and down in simple harmonic motion with amplitude of 1.27 cm and frequency of 2.55 Hz. What is the maximum acceleration of the needle
Two cartons sit next to, and touching, each other on a frictionless horizontal surface. Calculate the contact force between these cartons when a horizontal force of 5.2 N is applied to the light carton
A roughly spherical astroid whose radius is 40 km rotates once every 2.4 hours. What is it's angular speed in milliradians/sec
Two charges are placed on the x axis. One of the charges q1= +8.5 C is at x1 = + 3.0 cm and the other q2= -21C is at x1 = + 9.0 cm. Find the net electric field (magnitude and direction) at.
Darius the dare devil plans to launch his rocket car at the top a ramp inclined at 20.0o to the horizontal over a pit of fire 20 meter in diameter, Determine where will he land
A large boat with a weight of 70000 tons moves at constant speed due west. What is the net force on the boat
Light of intensity 2.5W/m2 passes through the pupil of one of your eyes and eventually falls on your retina. The radius of the pupil is controlled by the iris.
Ball A has a mass of 0.90 kg and moves with an initial speed of 10.60 m/s. It collides with stationary balls B and C, whose centers are on a line vertical to the initial velocity of ball A and that are initially in contact with one-another.
a tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.33 ms. the car is
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