Estimate the volume and cost of water used by a family of five living in a detached home during a one-year period.
What will be an ideal response?
This problem is a team estimation problem. Each team's answers may vary and an exact answer is not provided.
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A conductive heat transfer of 15 W is applied to a metal bar whose length is 0.50- m. The hot end of the bar is at 80oC. Determine the temperature at the other end of the bar for (a) a copper bar (? = 401 W/m-K) with a cross-sectional area of 0.0005 m2, (b) a copper bar (? = 401 W/m-K) with a cross-sectional area of 0.005 m2, and (c) a zinc bar (? = 116 W/m-K) with a cross-sectional area of 0.005 m2.
Given: Q?cond=150 W; ?x = 0.50 m; T1 = 80°C What will be an ideal response?
The following list of potential design projects can be addressed by following the six-step design process discussed in the chapter. A team approach to a proposed solution, with three or four members on each team, is recommended. Develop a report and oral presentation as directed by your instructor.
? A device to prevent the theft of helmets left on motorcycles ? An improved rack for carrying packages or books on a motorcycle or bicycle ? A solar-powered battery charger ? A device to permit easier draining of the oil pan by weekend mechanics ? A heated steering wheel for cold weather ? A sun shield for an automobile ? An automatic pet feeder for proper metering of food ? A storage system for a cell phone in a car (including charger) ? An improved wall outlet for multiple uses ? A beverage holder for a stand-up work desk ? A key finder for when you loose your keys ? An improved automobile traffic pattern on campus ? An alert for drowsy or sleeping drivers ? Improved bicycle brakes ? A campus transit system ? Improved pedestrian crossings at busy intersections ? Improved parking facilities in and around campus ? A device to attach to a paint can for pouring ? An improved soap dispenser ? A better method of locking weights to a barbell shaft ? A shoestring fastener to replace the knot ? A better jar opener ? A system or device to improve efficiency of limited closet space ? A shoe transporter and storer ? A device to pit fruit without damage ? An automatic device for selectively admitting and releasing pets through an auxiliary door ? A device to permit a person loaded with packages to open a door Problem continued on next page... ? A more efficient toothpaste tube ? A fingernail catcher for fingernail clippings ? A more effective alarm clock for reluctant students ? A device to help a parent monitor small children’s presence and activity in and around the house ? A simple pocket alarm that is difficult to shut off, used for discouraging muggers ? An improved storage system for luggage, books, and so on in dormitories ? A lampshade designed to permit one roommate to study while the other is asleep ? A device that would permit blind people to vote in an otherwise conventional voting booth ? A bicycle for a child with disabilities ? A silent wake-up alarm ? Home aids for the blind (or deaf) ? A safer, more efficient, and quieter air mover for room use ? A can crusher ? A rain-sensitive house window that would close automatically when it rains ? A better grass catcher for a riding lawn mower ? A built-in auto refrigerator ? A better camp cooler ? A dormitory cooler ? An impact-hammer adapter for electric drills ? An improved method of detecting and controlling the level position of the bucket on a bucket loader ? An automatic tractor-trailer-hitch aligning device ? A jack designed expressly for motorcycle use (special problems involved) ? Improved road signs for speed limits, curves, deer crossings, and so on ? A device for dealing with oil slicks ? An egg container (light, strong, compact) for camping and canoeing ? Ramps or other facilities for handicapped students
Two technicians are discussing vacuum brake boosters. Technician A says that when the engine is running and the driver's foot is off the brake pedal, a vacuum is present on both sides of the booster diaphragm. Technician B says that when the brakes are in the applied position, vacuum is present on the front side of the diaphragm. Which technician is correct?
A) Technician A only B) Technician B only C) Both Technicians A and B D) Neither Technician A nor B
A minimum of ____ is usually placed between window openings.
A. 2'' (50 mm) B. 3'' (75 mm) C. 6'' (150 mm) D. 12'' (300 mm)