Electrons are positively or negatively charged

A hollow steel composite door with an 18-guage metal facing, hung on butt hinges with nonremovable pins, often with ventilation

Nadya [2.5K]

Answer:

Average industrial personnel door

Explanation:

Going by the description in which the door has ventilation louvers or glass panel, this shows that it can never be any type of security door. This is because with louvers or glass panel, it can be easier for any intruder to look or break into the house or space that is intended to be protected fully.

Hence, an hollow steel composite door with an 18-guage metal facing, hung on butt hinges with nonremovable pins, often with ventilation louvers or glass panels is likely an Average industrial personnel door

5 0

3 years ago

The barrel of a bicycle tire pump becomes quite warm during use. Explain the mechanisms responsible for the temperature increase

Alexeev081 [22]

Answer:

The air heats up when being compressed and transefers heat to the barrel.

Explanation:

When a gas is compressed it raises in temperature. Assuming that the compression happens fast and is done before a significant amount of heat can be transferred to the barrel, we could say it is an adiabatic compression. This isn't exactly true, it is an approximation.

In an adiabatic transformation:

$P^{1-k} * T^k = constant$

For air k = 1.4

SO

$P0^{-0.4} * T0^{1.4} = P1^{-0.4} * T1^{1.4}$

$T1^{1.4} = \frac{P1^{0.4} * T0^{1.4}}{P0^{0.4}}$

$T1^{1.4} = \frac{P1}{P0}^{0.4} * T0^{1.4}$

$T1 = T0 * \frac{P1}{P0}^{0.4/1.4}$

$T1 = T0 * \frac{P1}{P0}^{0.28}$

SInce it is compressing, the fraction P1/P0 will always be greater than one, and raised to a positive fraction it will always yield a number greater than one, so the final temperature will be greater than the initial temperature.

After it was compressed the hot air will exchange heat with the barrel heating it up.

5 0

3 years ago

Consider that a system has two entities, Students, Instructors and Course. The Student has the following properties: student nam

tekilochka [14]

Answer:

There's no answer ?

Explanation:

5 0

4 years ago

A sinusoidal voltage source produces the waveform, v t = 1 + cos 2πft. Design a system with v t as its input such that an LED wi

DerKrebs [107]

Answer:

See explaination

Explanation:

LM358 is the useful IC which works as buffer. It enables circuit to remove overloading effect on each other. Image is in attachment.

We can define a light-emitting diode (LED) as a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons

See attached file for detailed solution of the given problem.