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Which one of the following statements is correct concerning the purpose of the surfactant secreted by the alveoli in the lungs?
(A) The surfactant increases the surface tension in the mucouscoating the alveoli, helping them expand.(B) The surfactant decreases the surface tension in the mucouscoating the alveoli, allowing them to expand for a smaller pressure difference.(C) The surfactant prevents air in the alveoli from leaking intothe surrounding tissue.(D) The surfactant acts as a chemical catalyst for the exchange ofoxygen and carbon dioxide in the lungs.(E) The surfactant acts as a ‘glue’ to attach the capillaries to the alveoli.
Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 3.8 x 1028 kg and 1.3 x 103 m. Find the density of such a star
The supersonic aircraft Concorde has a length of 63.0 m when sitting on the ground on a typical day when the temperature is 15.0 C . The Concorde is primarily made of aluminum. In flight at twice the speed of sound, friction with the air warms the Co..
A 115.29 g ice cube at -11°C is placed in an aluminum cup whose initial temperature is 79°C. What is the mass of the cup
Find the current in a 11.00 ? resistor connected to a battery that has an internal resistance of 0.25 ? if the voltage across the battery (the terminal voltage) is 24.00 V
A weather satellite encircles the earth at an orbital speed of 6200 m/s. How high above the earth's durface does it orbit
A 10 gauge copper wire carries a current of 27 A. Assuming one free electron per copper atom, calculate the drift velocity of the electrons
A right side view automobile mirror with a radius of curvature of 15.0 m reflects an object at a distance of 10.0 m from the mirror. calculate the magnification factor
A football is kicked off at a speed of 24 m/s at 30 degree about the horizontal and lands on the field. What is the horizontal distance from the starting point
A 9.00 kg box hangs in static equilibrium. Find the tension in each rope. T1 on the left makes an angle of 15 degrees below the horizontal and is attached to the 9.00 kg box
A block with mass m = 2.00 kg is placed against a spring on a frictionless incline with angle ? = 34°. How far along the incline is the highest point from the release point
The pilot of an aircraft wishes to fly due west in a 47.7 km/h wind blowing toward the south. In what direction should the aircraft head
After 12.6 s, a spinning roulette wheel has slowed down to an angular velocity of 2.82 rad/s. Determine the angular displacement of the wheel
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