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Question: Using simple momentum theory, develop an expression for the thrust of a propeller in terms of disc area, air density, and axial velocities of the air a long way ahead, and in the plane, of the propeller disc. A helicopter has an engine developing 600 kW and a rotor of 16-m diameter with a disc loading of 170 N m-2. When ascending vertically with constant speed at low altitude, the product of lift and axial velocity of the air through the rotor disc is 53% of the power available. Estimate the velocity of ascents.
a diagnostic tube has a target with a length of 10 mm. the electrons are focused along a strip of thenbspanode 2.5 mm
a tabletop gamer has designed a game that requires three dice to be thrown onto a tray with a measurement grid. to add
A stick of uniform density with mass M = 8 kg and lengthL = 0.7 m is pivoted about an axle which is perpendicularto its length and located 0.15 m from one end. Ignore any friction between the stick and the axle.
An x-ray with wavelength .18 nm is emitted when an L shell electron makes a transition to the K shell. What is the atomic number of the atom
Two cars, each with a mass of 6000 kg, hit head on each traveling at 80 km=h. Estimate the increase in internal energy absorbed by the materials in each car.
a person with a mass of 50 kg is holding on to a rope of 15 kg which is attached to the ceiling. note that the person
What is the value of the kinetic energy of the block when it reaches B? How much work does the kinetic frictional force do during the BC segment of the trip?
A 1 cm long section of patellar ligament stretches to 1.001 cm when it is subjected to a tensile force of 10,000 N. What is the strain in this segment of ligament
A beam of light is sent directly down onto a glass plate (n = 1.5) and a plastic plate (n = 1.2) that form a thin wedge of air (see the drawing). An observer looking down through the glass plate sees the fringe pattern shown in the lower part of the ..
A 3.08 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 2.13 m in 1.60 s. Find the magnitude of the frictional force acting on the block
Suppose that while moving into an apartment you move a refridgerator into place by sliding it across the floor. What is the least force you could exert on the fridge to move it
Water is pumped into a storage tank from a welldelivering 23.0 gallons of waterin 35.0 seconds through a pipeof 1.00 in.2 cross-sectional area. What is theaverage velocity of the water in the pipe as the water is pumpedfrom the well?
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