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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? Thank You
A car with a mass of 1.50x10^3 kg starts from rest and accelerates to a speed of 18.0 m/s in 12s. Assume that the force of resistance remains constant at 400-N all through this time. What is the average power developed by the car's engine?
A hunter wishes to cross a river that is 1.4km wide and flows with a speed of 5km/h parallel to its banks.
At high noon, the Sun delivers 1.10-kW to each square meter of a blacktop road. If the hot asphalt loses energy only by radiation, what is its equilibrium temperature.
A ranger in a national park is driving at 44 km/h when a deer jumps onto the road 70 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration of -3.00 m/s2.
A source of 116m In (half-life = 54.0 min.) is counted using a G-M tube. Successive 1-min observations gave 131,340 counts, calculate the true interaction rate in the G-M tube at 12:00
An AC generator has an output rms voltage of 58 V at a frequency of 76 Hz. If the generator is connected across a 30 mH inductor, find the inductive reactance
A 59.0 kg pole vaulter running at 9.5 m/s vaults over the bar. If the vaulter's horizontal component of velocity over the bar is 1.5 m/s and air resistance is disregarded, how high was the jump.
You are in a hot air balloon (yes, another balloon problem!) rising from the ground at a constant velocity of 2.70 m/s upward. To celebrate the takeoff, you open a bottle of champagne, expelling the cork with a horizontal velocity of 4.00 m/s rela..
An object located 32.1 cm in front of a lens forms an image on a screen 9.5 cm behind the lens. determine the magnification of the object
Discover the magnetic field on the z axis What happens if the block is immersed in carbon disulfide
You are driving a car that weighs 1500 kg at 50 km/h, How much force would you need to apply on the wheels of your car through the breaks in order to be able to stop short of hitting the cat
five resistors are connected to a battery with an emf of 12 V and internal resistance of 1 ohm. calculate the external resistance of the circuit
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