# Can you solve the burning stick riddle? ft Simone Giertz part 3/3 | Summary and Q&A

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February 4, 2017
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Physics Girl
Can you solve the burning stick riddle? ft Simone Giertz part 3/3

## TL;DR

In this video, Physics Girl and Simone Giertz discuss riddles related to water displacement and the differences between servo motors and DC motors.

## Key Insights

• 💦 Displacing water is dependent on weight and density, not just volume.
• 🎮 DC motors control velocity while servo motors control precision.
• 🫦 A byte consists of 8 bits, with a bit being the smallest unit of information.

## Transcript

Hi, I'm Dianna. You're watching Physics Girl. And welcome to the last part of physics riddles with my friend, the Queen of Imperfect Robots, Simone Giertz. If You haven't seen the last part, I've got a link in the description and a card and, you know, all the good stuff. Here's a recap of the second riddle and the answer. All right, you're sitting... Read More

## Questions & Answers

### Q: Why does the water level sink when a rock sinks in water?

The weight of the stone displaces more water than its volume because it is more dense than water. Therefore, the water level goes down.

### Q: How do servo motors and DC motors differ in their functions and user control?

DC motors are controlled for velocity while servo motors are used for precision. Servo motors are ideal for tasks such as picking up specific objects.

### Q: What is the difference between a bit and a byte?

A bit is smaller than a byte. A byte consists of 8 bits.

### Q: How can you time 45 minutes using two sticks that burn at different rates?

By burning one stick from both ends and another stick from only one end. When the first stick burns out, flip the other end of the second stick to time 45 minutes.

## Summary & Key Takeaways

• Physics Girl and Simone Giertz discuss the answer to a riddle about a sinking rock in water, concluding that the water level will sink.

• They explain the difference between servo motors and DC motors, with DC motors controlling velocity and servo motors controlling precision.

• The duo also talks about the difference between a bit and a byte, with a byte being 8 bits.

• Lastly, they explore a riddle about timing 45 minutes using two sticks that burn at varying rates.