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Air flows in a 20-cm-diameter duct at 120-C and 120 kPa with a mass flux of 5 kg=s. The circular duct converts to a 20-cm square duct in which the temperature and pressure are 140-C and 140 kPa, respectively. Determine the velocities in both sections of the duct.
what would be the orbital period if the earth were replaced by a star of mass equal to the solar mass in a circular
2kg block located on an incline plane with an angle of 60 degrees. the Force is a horizontal force. What is the normal force exerted on the block
A double convex lens (convex on both sides) is made of glass with an index of refraction of 1.65. What is the magnitude of the larger radius
A child wishes to determine the speed a slingshot imparts to a rock, how can this be done using only a meter stick, a rock, and the slingshot?
A state trooper chases a speeder along a straight stretch of road; both vehicles move at 136 km/h. The siren on the tropper's vehicle produces a sound of 490 Hz. What frequency is heard by speeder? (Take the speed of sound in air to be 343 m/s.)
A person with perfect pitch sits on a bus bench listening to the 441-Hz horn of an approaching car. If the person detects a frequency of 479 -Hz, how fast is the car moving.
What is the size of the contact patch for a 90kg rider on a 10kg bike if his tires are pumped to 500kPa
A tennis ball is struck at the base line of the court, 12.5 m from the net. How far beyond the net will the ball hit the ground
A 0.700kg block is attached to a spring with spring constant 14.5N/m . While the block is sitting at rest, find The amplitude of the subsequent oscillations
The electric field at the place where a 4 C charge is located is 100 N/C. What is the electrical force acting on the charge
A roach that runs for its life because you try to hit it with your physics book runs off the horizontal tabletop with a speed of 0.578 m/s, Find the height of the table
If a copper wire has a resistance of 28.2 Ω at a temperature of 24.5oC, determine what resistance does it have at 68.8oC
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