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What are current efficiencies achieved by the following categories of turbomachines?
(a) Wind turbines;
(b) hydraulic turbines;
(c) power plant steam turbines;
(d) aircraft gas turbine engines;
(e) natural gas pipeline compressors;
(f) home vacuum cleaner blowers;
(g) laptop computer cooling fan;
(h) irrigation pumps;
(i) dentist drill air turbines. What is being done to improve these devices?
An 867 kilogram (1916 lb) dragster, starting from rest, attains a speed of 25.4 m/s (56.9 mph) in 0.59 second. Find what horizontal force does the seat exert on the driver
A novice skier starting from rest slides down a frictionless 32 degree incline whose vertical height is 125 meters
A Lens maker desires to make a lens of focal length 30 cm. in air. The equipment in the shop is set to make lens faces of 20 cm. What would the focal length of this lens be in water (n=4/3)? What index of refraction must the lens material have to pro..
A rocket which has an exhaust speed of 8.0 km/s is to have a lift-off vertical acceleration of 8.0 m/s2 from the NASA launch pad. at what minimum rate must the rocket consume fuel
Your company makes anemometers and plans to install light bulbs on them for high wind warnings. calculate the number of turns in the coil wire needed to light the bulb
question an empty rubber balloon has a mass of 0.0109 kg . the balloon is filled with helium at a density of 0.178 kgm3
Red light of wavelength 675.0 nm produces photoelectrons from a certain photoemissive material. What is the material's work function
Vector A has the magnitude of 25 m and the direction of 20 degrees W of N, whereas vector B has the magnitude of 35 m and the direction of 35 degrees S of E. Find the magnitude and direction of the vector A+B
A 75.0 kg football player leaps straight up into the air (with no horizontal velocity) to catch a pass. how fast was the ball travelling
A capacitor is placed parallel across a resistive load in a circuit. C=0.858*10^-6F and R=204 ohms. What fraction of the current goes through the capacitor
A long rod of lenght " L " and cross sectional area "A" is weighted such that when it is placed in a bucket of water it floats vertically. determine the magnitude of the buoyant force on the rod
At what time after the discharge begins is the energy stored in the capacitor reduced to half its initial value? RC=3ms (timeconstant for capacitor to discharge)
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