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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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Natalya Carrillo

Engineering

When did joe booker start in the computer field

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Engineering

What is hot tear in casting? How can we avoid it?

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Engineering

What should you, the worker, be aware of with regard to evacuation procedures at your workplace

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Engineering

Suppose that you and two classmates are discussing the design of a roller coaster. One classmate says that each summit must be lower than the preceding one. Your other classmate says this is nonsense, for as long as the first one is the highest, it doesn't matter what height the others are. What do you say

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Russell Mendoza

Engineering

Why is the Diesel engine usually used for big trucks and the Otto engine usually used for compact cars?

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Emmett Trujillo

Engineering

An alloy to be used for a spring application must have a modulus resilience of at least 0.79 x 106 J/m3 (0.79 x 106 Pa). What must be its minimum yield strength (in MPa) ? Assume that the modulus of elasticity for this alloy is 102 GPa

Using Ur=Sig^2/2E, I am getting 401.447E6 Mpa but apparently thats wrong.

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Engineering

Assuming that the following three variables have already been declared, which variable will store a Boolean value after these statements are executed?

choice = true;

again = "false";

result = 0;

a. choice

b. again

c. result

d. none of these are Boolean variables

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