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A typical adult human lung is about 2.05 liters and is made up of large numbers of small spherical cavities called alveoli. Assuming that the typical diameter of a single alveolus is 0.000335m how many avioli are there in the lung.
At what angle to the surface must a submerged diver in the lake look toward the surface to see the setting sun just along horizon.
The mass of a roller-coaster car, including its passengers, is 495kg. Its speed at the bottom of the track in the figure below is 17.00 m/s. The radius of this section of track is r1 = 26 m. Find the force that a seat in the roller-coaster car exerts..
An astronaut is traveling in a space vehicle that has a speed of 0.485c relative to Earth. The astronaut measures his pulse rate at 77.5 per minute. What pulse rate does the Earth observer measure
The position of a rocket sled on a straight track is given as x = a t3 + b t2 + c, What is the sled's average speed between t = 3.48 s and t = 6.92 s
Chef at the infamous Fattening Tower of Pizza tosses the spinning disk of uncooked pizza dough into the air. The disk's diameter increases during the flight, whereas its rotational speed.
Drawing on Eratoshthenes' method, if two observers are due north and south of each other and are separated by 400 km, what is circumference of their spherical world if they see the similar star on their meridian at altitudes of 23degrees and 47deg..
The minute hand of a wall clock measures 14 cm from its tip to the axis about which it rotates. The magnitude and angle of the displacement vector of the tip are to be determined for three time intervals.
What is the distance Delta y_max-min between the second maximum of laser 1 and the third minimum of laser 2, on the same side of central maximum.
In a photoelectric-effect experiment it is observed that no current flows unless the wavelength is less than 470 nm. What is the stopping voltage required if light of wavelength 410nm is used
Singly charged uranium-238 ions are accelerated through a potential difference of 2.26 kV and enter a uniform magnetic field of magnitude 1.98 T directed perpendicular to their velocities. Determine the radius of their circular path
The intensity (in W/m2) of one sound is 2.97 times as great as the intensity of another sound. Relative to the quieter sound, what is the intensity level of the louder sound
a stone is projected at a cliff of height h with an initial speed of 44.0 m/s directed at an angle θ0 = 62.0° above the horizontal. find the height h of the cliff
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