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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 multiplied by 10-9 m2. The concentration of oxygen in the air outside the insect is 0.10 kg/m3, and the diffusion constant is 1.1 multiplied by 10-5 m2/s. If the mass per second of oxygen diffusing through a trachea is 1.7 multiplied by 10-12 kg/s, find the oxygen concentration at the interior end of the tube.
A person bending forward to lift a load "with his back" (Figure (a)) rather than "with his knees" can be injured by large forces exerted on the muscles and vertebrae. The spine pivots mainly at the fifth lumbar vertebra, with the principal support..
Incoming UNPOLARIZED light of intensity 17 LUX passes through a linear polarizer, with its transmission axis oriented vertically. Calculate the final intensity of the light after it has passed through both polarizers
The density of a 4.07-m long rod can be described by the linear density function ?(x) = 117 g/m + 15.1x g/m2. Determine the total mass of the rod
an 8.000-mw laser beam emits a cylindrical beam of light 0.9000 mm in diameter. what is the rms value of the electric
A bartender slides a beer mug at 1.8 m/s towards a customer at the end of a frictionless bar that is 1.4 m tall. What are the speed and direction of the mug at impact
An elevator is able to raise 9,800 N to a height of 37 m in 12 s, What is the elevator's power output and How much work does the elevator do
A slinky with N even loops of area A is L long. You hook it up to a circuit and increase the current at a rate of 2.0 A/s, Now calculate the new induced EMF
As people sing in church, the sound level everywhere inside is 107 dB. No sound is transmitted through the massive walls, but all the windows and doors are open on a summer morning. Their total area is 23.0 m2. (a) How much sound energy is radiated i..
Sunlight falls on two Polaroids. If 31% of the light intensity is transmitted. What is the angle between the polarization axes of the two Polaroids
On her way to visit Grandmother, Red Riding Hood sat down to rest and placed her 1.2 kg basket of goodies beside her. What is the acceleration of the basket
A bicycle wheel slows down uniformly to rest over a ditance of 45 m becuase the bicyclist sees something int he road ahead. What is the wheels inital angular velocty
A wooden block is pulled 12 m across a frictionless surface using a rope. What angle does the rope make with the horizontal
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