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Thermoelectric coolers that plug into the cigarette lighter of a car are commonly available. One such cooler is claimed to cool a 12-oz (0.771-lbm) drink from 78 to 38°F or to heat a cup of coffee from 75 to 130°F in about 15 min in a well-insulated cup holder. Assuming an average COP of 0.2 in the cooling mode, determine (a) the average rate of heat removal from the drink, (b) the average rate of heat supply to the coffee, and (c) the electric power drawn from the battery of the car, all in W.
Determine if this can be accomplished by installing PV cells on part of the roof of the car. Also, find out if any car is currently ventilated this way.
A high-strength steel simply supported W24 X 76 beam carries a uniformly distributed load over its entire length of 25 ft. (a) If the allowable stress is 33 ksi, what may be the value of the load, in addition to the beam's own weight
You are given the following information about a dry-batchpaving operation. You are going to use one mixer that has a servicerate of 30 serives/hr. The dry-batch trucks you use forbringing concrete to the paver have an arrival rate of 7.5 arrivals/hr...
(a) At what angle did the player have to shoot the cue ball so that the eight ball entered the pocket at C? (b) In what direction did the cue ball move after the collision? (c) What percentage of its kinetic energy did the cue ball impart to the e..
Compute the critical buckling load for a 2.5m timber column of full size square section 0.10m x 0.10m. The column has pinned ends(k=1). Assume the modulus of elasticity is 12Gpa and that the Euler formula applies.
At a certain temperature T1, a 6.288x10^1 mm rod of a copper alloy containing 3.1715x10^1 at% Ni has a resistivity of 2.788x10^1 x 10-8 O-m.
The dry density of a compacted sand is 1.87 Mg/m^3 and the density of the solids is 2.67 Mg/m^3. What is the water content of the material when saturated. Include a phase diagram.
The following data were collected at a nest of piezometers (several piezometers of different depths located within a few feet of each other), each of which is screened (open) only at the bottom.
A stainless steel tube with an outside diameter of 59 mm and a wall thickness of 5 mm is used as a compression member. If the axial normal stress in the member must be limited to 220 MPa, determine the maximum load P that the member can support.
The small block A rests on to1) of the large block B. Determine the largest value of applied force P that can he applied to block A without causing block B to slide up the inclined plane.
What is the maximum column load in kips that could be placed on a 4-ft square temporary footing on a sand for which the standard resistance is about N=15 and the water table is at the surface
Adriana wishes to accumulate $2,020,000 in 35 years. If 35 end-of-year deposits are made into an account that pays interest at a rate of 7% compounded annually, what size deposit is required each year to meet Adriana's stated objective?
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