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# Tutor profile: Saber N.

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Saber N.
Part-time tutor for more than 10 years, PhD student
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## Questions

### Subject:Basic Math

TutorMe
Question:

What is the relationship between \$\$e^x\$\$, \$\$ln(x)\$\$, and \$\$log(x)\$\$?

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Saber N.

\$\$ln(x)\$\$ is the inverse function of \$\$e^x\$\$. The only difference between \$\$log(x)\$\$ and \$\$ln(x)\$\$ is their base. It is assumed that: \$\$log(x)\$\$ = \$\$log_10(x)\$\$ \$\$ln(x)\$\$ = \$\$log_e(x)\$\$ It can be concluded that the \$\$10^x\$\$ is the inverse function of \$\$log(x)\$\$.

### Subject:Mechanical Engineering

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Question:

What is the fundamental difference between a compressor and a pump?

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Saber N.

Both devices increase the pressure of the working fluid. The conceptual difference between them is that compressors work with gases and pumps work with liquids. Although it seems a small difference, these two devices are very different in their design.

### Subject:Physics

TutorMe
Question:

Apply the first law of thermodynamic in your body as a control volume.

Inactive
Saber N.

Assuming the body is our control volume, the energy-in is the food that we eat. This energy takes two forms: 1- It can be stored in our body, 2- it can be used for regular body functions and doing workouts. The first law (energy equation) states that the energy-in and energy-out are always balanced. That means if I eat too much food without having enough activity, the energy will be stored in my body as fat.

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