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A low speed wind tunnel has an inlet cross sectional area of 2m2 and a test cross sectional area of 0.5m2. The pressure is 2116 lb/ft2 in and around the wind tunnel. The velocity of the air flow in the test section is 40 m/s. What is the inlet velocity?
What is the charge on negative electrode. Find out the wavelength.
A loudspeaker of mass 20.00 {rm kg} is suspended the distance of h = 2.40 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.50 {rm m}.
Use conservation of energy to determine the speed the child will have at the bottom of the arc when she is let go
During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 230 J from 440 J. Explain how high does she rise during this interval? Neglect air resistance.
A circuit consists of a battery connected to three resistors (65?, 26?, and 170?) in parallel. find the current through each resistor
A 20g ball of clay traveling east at 3.0m/s collides, What is the speed of the resulting ball of clay
Following the procedure in the video, create three traces of the pendulum motion of the cup. Compare the three traces for amplitude, wavelength, and frequency.
An open-pit coal mine consumes 71hectares of land, down to a depth of 23m, each year. What volume of earth, in cubic kilometres, is separate in this time.
Power lines at 20,000V (rms) are connected to a utility pole transformer. Find the ratio of the number of turns in the primary to the number of turns in the secondary
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.60 104 m/s, What is the orbital speed of the second satellite?
A prospector finds a solid rock composed of granite (? = 2650 kg/m3) and gold. The volume of the rock is 3.40 10-4 m3 and its mass is 3.87 kg. a) What mass of gold is in the rock? b) What percentage of the rock is gold by volume? c) What percentag..
Consider an object on an incline where friction is present. The angle between the incline and the horizontal is ? and the coefficient of kinetic friction is ?k. Find an expression for the acceleration of this object
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