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Air flows through a heating duct with a square cross-section with 9-inch sides at a speed of 6.1 ft/s. Just before reaching an outlet in the floor of a room, the duct widens to assume a square cross-section with sides equal to 16 inches. Compute the speed of the air flowing into the room (in ft/s), assuming that we can treat the air as an incompressible fluid.
Two friends are carrying a crate of mass 200 kg up a flight of stairs. The crate has length 1.25 m and height 0.500 m, What is the magnitude of the upper person's force
A 20.0kg crate slides down a 29° incline at constant speed. What is the force of friction between the crate and incline
The coefficient of kinetic friction between the road and each of the car tires is 0.219. How many meters does the car go before it comes to a complete stop?
An electron experiences the greatest force as it travels 3.4×106m/s in a magnetic field when it is moving northward. The force is vertically upward and of magnitude 7.7×10-13N. What is the magnitude of the magnetic field?
A golf ball is driven from a level fairway. At a time of 4.54 slater, the ball is traveling downward with a velocity of 42.4 m/sat an angle of 20.4° below the horizontal. Neglecting airresistance, calculate the initial velocity (magnitude anddirec..
At what angle of incidence should one of them shine a flashlight on the mirror so that the reflected beam directly strikes the other person
A 1.90 × 102-kg sculpture hangs from a horizontal rod that serves as a pivot about which the sculpture can oscillate. How far is the pivot from the sculpture\'s center of mass
A person pushes with a force of 10.0 N on a stick pin to try to push it into a bulletin board. find the average pressure (in Pascals) on the board at the tip of the pin
Electrical and magnetics fields (EMF) were thought to be correlated to Jacob's cancer. How could confirmation bias or ad populum fallacy play a role in the EMF
Two capacitors are connected parallel to each other. Let C1 = 3.50 ?F, C2 = 5.50 ?F be their capacitances, Calculate the potential difference across each capacitor: V1 = and V2 =
A galaxy has a rotation speed of 200 kilometers per second at a distance from its center of 10 kiloparsecs What is its mass within this distance
Determine the wave's amplitude. Determine the wave's wavelength.Determine the wave's frequency.Determine the wave's speed of propagation. Determine the wave's direction of propagation.
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