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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.
A 779-kg car stopped at an intersection is rear-ended by a 1820-kg truck moving with a speed of 15.0 m/s. If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find out the final speed of both vehicles ..
Calculate the volume charge density of the atmosphere
A person lifts a 950N box by pushing it up an incline. If the person exerts a force of 350N along the incline, what is the mechanical advantage of incline.
find friction force that acts on the bear.
A golf ball of mass 50 g released from a height 1.5m above a concrete floor bounces back to a height of 1.0 m. What is the amount of energy lost during the impact
Two tanks are engaged in a training exercise on level ground. The first tank fires a paint-filled training round with a muzzle speed of 237.5m/s, Find the distance between the tanks when the round was first fired
An electron is traveling through a region of space in which the electric field is along the +x direction, What is the acceleration of the electron
what is the maximum mass it can support in freshwater. find the maximum height of the projectile is equal to its horizontal range.
An airplane maintains a speed of 567 km/h relative to the air it is flying through as it makes a trip to a city 745 km away to the north.
What was the initial negative charge on one of the spheres, and what was the initial positive charge on the other?(Hint: Use charge conservation and solve for one of the initial charges. You will end up with a quadratic equation. The solutions giv..
In January from Indiana, Andromeda is high in the sky at 6pm local time. (Note that local time is about 40 minutes later than Eastern Standard Time, because Indiana is on the far western end of the time zone. The sun is at its highest point in the..
Evaluate the magnitude of the apparent weight of a 84 kg astronaut 4500 km from the center of the Earth's Moon in a space vehicle accelerating toward the Moon at 3.1 m/s^2?
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