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Calculate the rate of diffusion of Sodium chloride (NaCl) at 180 C through a stagnant film of water, 1.0 mm thick, when the concentrations are 20 % and 10% by weight on either side of the film. Density of 20% and 10% NaCl by weight are 1.1489 and 1.067 g /cc respectively. Diffusivity of NaCl in water is 1.26 x 10-6 m2 /sec.
A long rod, insulated to prevent heat loss along its sides, is in perfect thermal contact with boiling water (at atmospheric pressure) at one end and with an ice-water mixture at the other.
How much heat in joules is needed to raise the temperature of 9.0 L of water from 0C to 94.0C? (Hint: Recall the original definition of the liter.)------J
An electric heater is used to heat a room of volume 62m3 . Air is brought into the room at 50 and its completely replaced twice perhour. Heat loss through the walls amounts to approximately 850kcal/h. If the air is to be maintained at 20o C, what mi..
An insulating rod of length 11.7-cm and charge 27 nC is in a plane with a long straight uniform line charge. What is the electric force on the rod
A plane drops a package of food to stranded caribou on an ice flow in the Arctic Circle. How far short of the target should it drop the package
A classroom demonstration is done with an Atwood machine. The masses are m1 = 1.0 kg and m2 = 1.14 kg. what is the acceleration of gravity at that place
A cylinder of mass10.0kg rolls without slipping on a horizontal surface. What is the rotational kinetic energy about its center of mass
A 2.0 kilogram softball is pitched to you at 20 m/s. You hit the ball back along the same path, and at the same speed. find the magnitude of the average force the bat exerted
prepare a 750- to 1050-word paper in which you analyze your articles. address the following define consumer psychology.
An electric vehicle starts from rest and accelerates at a rate of 1.6 m/s2 in a straight line until it reaches a speed of 20 m/s. The vehicle after that slows at a constant rate of 1.4 m/s2 until it stops. (1) How much time elapses from start to s..
Supplies are being dropped from a Chinook helicopter at a military outpost. When the copter arrives over the landing area at an altitude of 1,040 m, it descends vertically at a constant speed 28 m/s and after 15 s drops the supply package. The copter..
Trained dolphins are capable of a vertical leap of 7.0m straight up from the surface of the water-an impressive feat. What maximum horizontal range could the dolphin achieve
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