7 Single-use earplugs require a professional fitting before they can be used.

A

True

B)

False

A closed, rigid tank fitted with a paddle wheel contains 2.0 kg of air, initially at 200oC, 1 bar. During an interval of 10 minutes, the paddle wheel transfers energy to the air at a rate of 1 kW.

Consider a fully developed flow in a circular pipe (negligible entrance effects), how does the convective heat transfer coefficient vary along the flow direction?

An engineer devises a scheme for extracting some power from waste process steam. The engineer claims that the steam enters the device at 340 F and quality 75%, and exits at 220 F and 65% quality.

In natural convection, the fluid is forced to flow over a surface or in a tube by an external mean such as a pump or a fan. a) - True b) - False

Which statement best describes how a hearing aid works? A microphone receives the sound, translates it to electronic signals, strengthens them, and sends them to the individual via the ear.

Where might you find recommendation engines at work?

Just getting to your class is enough for showing up. A) True B) False

A completely reversible heat pump produces heat at a rate of 100 kW to warm a house maintained at 25℃. The exterior air, which is at 0℃, serves as the source.

A closed system undergoes a process in which work is done on the system and the heat transfer Q occurs only at temperature Tb. For each case, determine whether the entropy change of the system is positive, negative, zero, or indeterminate.

A scientist who is evaluating an ancient human skeleton for signs of vitamin and nutrient deficiency is conducting: