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Atmospheric air at 20-C is flowing at 10 m=s. Calculate the drag force on
(a) a 10-cm-diameter smooth sphere,
(b)a 10-cm-diameter, 80-cm-long smooth cylinder with free ends,
(c)a 10-cm-diameter disk, and
d)a 10-cm-wide, 20-cm-long rectangular plate.
The velocity vector is normal to all objects.
There is a pulley with no friction and the masses will not be affected by air resistance. Evaluate the acceleration of each mass
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. find the oxygen concentration at the interior end of the tube
a rescue helicopter lifts a 70-kg person straight up by means of a cable. the person has an upward acceleration of 0.70
the mayor of your home town is worried that magnetic fields might cause cancer and proposes that the electric power
A student sits on a swivel seat. Initially the student is at rest, holding a spinning bicycle wheel that has an angular velocity of 13.9 rad/s. Find the student's final angular velocity
How many more revolutions would it take the disk to reach an angular speed - magnitude of the frictional force exerted by the track on the car tires to keep the car in a circle.
If the maximum acceleration the vehicle's brakes are capable of is -5 m/s2, what is the maximum reaction time of the motorist that would allow her or him to avoid hitting the deer.
the great gray-green greasy zambezi river flows over victoria falls in south central africa. the falls are
A proton and an electron are each located at rest in a uniform electric field of magnitude 544 N/C. Estimate the speed of each particle 52.8 nanoseconds after being released
The average density of the material in intergalactic space is approximately 2.5 x 10-27 kg/m3. Determine the volume of a gold sample
a horizontal rifle is fired at a bulls-eye. the muzzle speed of the bullet is 670 ms. the gun is pointed directly at
Two large parallel metal plates are 1.4 cm apart and have charges of equal magnitude but opposite signs on their facing surfaces. what is the electric field (in V/m) in the region between the plates
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