Workers take public transportation daily
In San Francisco, 30% of workers take public transportation daily (USA Today, December 21,2005).
In a sample of 9 workers, what is the probability that at least three workers take public transportation daily (to 4 decimals)?
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A commercially available sump pump is capable of deliver-ing 2800 gallons per hour of water through a vertical lift of 16 feet. Calculate the power delivered by the pump to the water.
A design specification requires that a 782 pound vehicle be able to climb a 16 degree incline at 14 mph. What is the minimum horsepower required of its engine.
The allowable shear stress in the bolts is 10000 psi, determine the minimum number of bolts required so that the strength of the coupling equals or exceeds the shaft strength.
Assume the mean shift is 1.5sigma (sigma is the process standard deviation, that is, the standard deviation of individual observations), what is the probability of type II error under this mean shift?
The left steel section has a 120 mm diameter and is 500 mm long while the right brass section has a 80 mm diameter and is 400 mm long. Determine the torque in each section.
The overall rise in the pipe from tank to trough is 3 feet. Calculate the required air pressure above the water in the tank to produce 7.5 gal/min of flow (use f = .025).
A refrigerator operates on the ideal vapor compression refrigeration cycle with R-134a as the working fluid between the pressure limits of 120 kPa and 800 kPa.
The kinetic energy of a particle is equal to the energy of a photon. The particle moves at 4.2% of the speed of light. Find the ratio of the photon wavelength to the de Broglie wavelength of the particle. Take the speed to be non-relativistic.
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