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Engineering

Bridge A is the longest suspension bridge in a Country. Bridge B is 5555 feet shortershorter than Bridge A. If the length of Bridge A is m feet, express the length of Bridge B as an algebraic expression in m. Write an expression representing the length of Bridge B in terms of m.

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Engineering

A copper alloy cylinder 1.17 m long with a diameter of 32.39 mm is subjected to a tensile stress of 1,302 psi along its length. Assuming this applied stress is purely elastic calculate the diameter, in mm, of the cylinder under this load. For copper, the elastic modulus is 1,206,172 psi and the Poisson's ratio is 0.42.

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Engineering

In a piece of aluminum you want to make a pocket (milling of cavities), an end mill tool of 6 mm in diameter and 4 cutting sides will be used, the height of the cutting sides of the tool is 25 mm. The feed that will be taken per tooth will be 0.00003 meters / tooth, and a linear feed rate of 2.4 mm / second. Calculate the cutting speed in mts / min.

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Engineering

The bars of the truss each have a cross-sectional area of 1.25 in2. If the maximum average normal stress in any bar is not to exceed 20 ksi, determine the maximum magnitude P of the loads that can be applied to the truss.

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Engineering

Suppose you want to design a medical centrifuge to subject samples to normal accelerations of 1000 g's. (a) If the distance from the center of the centrifuge to the sample is 300 mm, what speed of rotation in rpm is necessary? (b) If you want the centrifuge to reach its design rpm in 1 min, what constant angular acceleration is necessary?

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Carissa Mendoza

Engineering

What is Not considered as metric system? a. Length b. Mass c. Time d. Volume e. Temperature

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Engineering

To operate a vehicle in Florida, you must

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Engineering

What type of models can be communicated in more than one way.

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Engineering

It is well established that the thermal efficiency of a heat engine increases as the temperature TL at which heat is rejected from the heat engine decreases. In a effort to increase the efficiency of a power plant, somebody suggests refrigerating the cooling water before it enters the condenser, where heat rejection takes place. Would you be in favor of this idea? Why?

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Engineering

What is the Thermodynamic (Absolute) temperature scale?

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Engineering

You kick a soccer ball with a mass of 2.5 kg at a speed of 10 m/s towards the net. The soccer ball has a kinetic energy of

(Don't forget your units!)

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Engineering

In an apartment the interior air temperature is 20°C and exterior air temperatures is 5°C. The wall has inner and outer surface temperatures of 16°C and 6°C, respectively. The inner and outer convection heat transfer coefficients are 5 and 20 W/m2. K, respectively. Calculate the heat flux from the interior air to the wall, from the wall to the exterior air, and from the wall to the interior air. Is the wall under steady-state conditions?

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Engineering

A solid square rod is cantilevered at one end. The rod is 0.6 m long and supports a completely reversing transverse load at the other end of + / - 2 kN. The material is AISI 1080 hot-rolled steel. If the rod must support this load for 104 cycles with a factor of safety of 1.5, what dimension should the square cross section have? Neglect any stress concentrations at the support end. Hint: Initially, assume the size endurance limit modification factor is kb=0.85; then check this assumption after the actual size is determined.

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Engineering

Which of these sensors would be least likely used as an input sensor?

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Engineering

A vertical piston-cylinder device contains water and is being heated on top of a range. During the process, 10 kJ of heat is transferred to the water, and heat losses from the side walls amount to 80 J. The piston rises as a result of evaporation, and 2 J of work is done by the vapor. Determine the change in the energy of the water for this process.

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