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Insects do not have lungs as we do, nor do they breathe through their mouths. Instead, they have a system of tiny tubes, called tracheae, through which oxygen diffuses into their bodies. The tracheae begin at the surface of the insect's body and penetrate into the interior. Suppose that a trachea is 1.9 mm long with a cross-sectional area of 2.1 multiply.gif 10-9 m2. The concentration of oxygen in the air outside the insect is 0.30 kg/m3, and the diffusion constant is 1.1 multiply.gif 10-5 m2/s. If the mass per second of oxygen diffusing through a trachea is 1.7 multiply.gif 10-12 kg/s, find the oxygen concentration at the interior end of the tube.
Fixed in the frame F is a sheet of charge, of uniform surface density sigma, which bisects the dihedral angle formed by the x-y and the y-z planes. What is the surface charge density sigma prime
A snowboarder is pulled by a tow rope along a horizontal surface with a constant force of 60 N. How far must the boarder be pulled, starting from rest, so that her final kinetic energy is 500 J.
A 1kg ball with a speed of 3 m/s collides head on, elastically, with a 2 kg ball moving at 1 m/s. What will be the velocity of each ball after the collision
A dentist uses a small mirror of radius 45 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 14 mm from the tooth, what is the magnification of the resulting image.
On planet A, the value of g is 11 m/s squared. If bluber weighs 732 N on planet A, how much would he weigh on earth
An aluminum rod is 17.0 cm long at 20°C and has a mass of 350 g. what is the change in length of the rod
Eight books, each 3.90 cm thick with mass 1.70 kg, lie flat on a table. How much work is required to stack them on top of each other.
A 1000-kg car is moving at 30.0 m/s around a horizontal curve whose radius is 100 m. What is the magnitude of the frictional force
A person sees clearly wearing eyeglasses that have a power of -5.00 diopters, If the person wants to switch to contact lenses placed directly on the eyes, what lens power should be prescribed
What is the net electric force acting on particle.
A centrifuge in a medical laboratory is switched on and rotates through 3900 revolutions. determine the final angular speed of the centrifuge
A 4.0-W resistor has a current of 3.0 A in it for 5.0 min. How many electrons pass through the resistor
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