Other Engineering Answers

for rehabilitating some old concrete pavements in your area.IN brief note your superiors,discuss the equipment needed ,deleterious constituents to be avoided,and the cost economy of using the crushed concrete from old pavements as a source of aggregates for construction of new pavements.Discuss also the method for the rehabilitation that you will use .

Today’s electronics specializes in manufacturing modern electronic components. It also builds the equipment that produces the components. Phyllis Weinberger, who is responsible for advising the president of Today’s Electronics on electronics manufacturing equipment, has developed the following table concerning a proposed facility.

Thermodynamics project
The design a device that converts heat produced by a candle into the work
of raising a 250g object to a height of 20cm vertically.Students are only allowed to use one or two tea light candles as their heat source. Not allowed to modify the candle in any way other than to reduce the overall weight by removing some wax. not allowed to design other sources of energy, (i.e. kinetic,
potential, electrical or chemical) into their project. This meant no other fuel sources may be
ignited, no springs, catapults, sling shots, fly-wheels, etc. that are pre-loaded and simply need to
be triggered, or other similar shenanigans. The candle could not be used to combust any other
material. The goal for the students was to come up with a design which converted the candle heat
into work.

I have a fluid dynamics question.

If I have a constant stream of water moving 7 ft/s that flows directly into a rectangular 8" x 6" opening (at the collection end) that tapers down over a 15" length to a 8" x 1-1/2" outlet, how much will the speed and pressure increase at the outlet.

Thanks a bunch,

Todd

Q5.Calculate the frequency of a sound wave which has wavelength of 0.7727m and a velocity of 340m/s

Q4.Calculate the wavelength of a 10kHz sound in air at a temperature of 300 .

Q3. Calculate the difference between sound levels measured at 10m and at 63 m from a perfect line source of sound.

Q2. The intensity of sound from a loud speaker, measured at a distance of 1 meters from the source is 5.0x10--4 W/m2
(a) Calculate the intensity of the sound at a distance 6 m from the source.
(b) Calculate the decibel change between the two positions.

Q1.If the sound 10 meters from the stage at a rock concert is at the 120dB what is the intensity level 100 meters away

calculate the change in sound level when the intensity of a sound is doubled