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Consider an aircraft powered by a turbojet engine that has a pressure ratio of 12. The aircraft is stationary on the ground, held in position by its brakes. The ambient air is at 27 C and 95 kPa and enters the engine at a rate of 10 kg/s. The jet fuel has a heating value of 42,700 kJ/kg, and it is burned completely at a rate of 0.2 kg/s. Neglecting the effect of the diffuser and disregarding the slight increase in mass at the engine exit as well as the inefficiencies of engine components, determine the force that must be applied on the brakes to hold the plane stationary.
With a particular grating a doublet of the two wavelengths 731.3 and 732.1 nm is viewed in the third order at 9.3° to the normal, find the grating spacing in nanometers
A 5.20 microFarad parallel-plate air capacitor has a plate separation of 5.00mm, Calculate the energy density in the region between the plates, in units of J/m^3
A beam of 6 MeV electrons passes through a 400 micro-meter thick silicon detector. Estimate the energy lost by the electrons when crossing 200 micro-meters, 300 micro-meters and the full thickness of the detector.
A 1 kg ball is attached to a 2 m long piece of very light string and suspended in such a way that it can freely swing and it passes just above the ground.
Two forces, F? 1 and F? 2, act at a point. F? 1 has a magnitude of 8.20N and is directed at an angle of 62.0?, below the negative xaxis in the third quadrant What is the x component of the resultant force
Write down an equation for the radial component
Suppose an object is set sliding, with a speed less than escape velocity, on an infinite frictionless plane in contact with the surface of the Earth. Describe its motion.
The mousetrap car has a mass of 100 grams and starts travelling at the speed of 1.80 m/s and after 5seconds get the rested? What force did the motor exert.
The projection lens in a certain slide projector is a single thin lens. A slide 24.3 mm high is to be projected so that its image fills a screen 1.86 m high. Determine the focal length of the projection lens
A college student produces about 135 kcal of heat per hour on the average. What is the rate of energy production in watts
A .300kg mass attached to the end of a .75m string is whirled around on a smooth level table. If the maximum tension that the string can withstand is 250N, then what most tangential speed can the mass have if the string is not to break.
You're carrying a 4.0-m-long, 25 poles to a construction site when you choose to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 from its tip. How much force should you exert to keep pole motionles..
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