project for school

Question

Get a straw and fill a drinking glass with water, then complete the following steps. During each step, observe the behavior and properties of this liquid matter as you interact with it. Finally, answer the questions that follow.

1. Tap the drinking glass with your finger.

How does the glass feel?

What sound does the glass make when you tap it?

How does the glass move in response to your touch?

2. Swirl the water around in the glass using the straw.

How does the water move?

What shape does the water take?

What sound does the water make?

3. Put the straw into the glass of water and blow air through it.

How can you see the air as it moves through the straw and into the water?

What sound does the air make as it moves through the straw and into the water?

Where does the air go after you stop blowing through the straw?

Answer 1

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To find the horizontal force \( F \) that a sprinter must exert on the starting blocks to produce an acceleration of 15 m/s², we can use Newton's second law of motion, which relates force, mass, and acceleration:

\[ F = m \cdot a \]

Where:

- \( F \) is the force (in newtons, N)

- \( m \) is the mass of the sprinter (in kilograms, kg)

- \( a \) is the acceleration (in meters per second squared, m/s²)

Given:

- Mass of the sprinter (\( m \)) = 62 kg

- Acceleration (\( a \)) = 15 m/s²

Now, plug in the values and calculate the force:

\[ F = (62 \, \text{kg}) \cdot (15 \, \text{m/s²}) \]

\[ F = 930 \, \text{N} \]

So, the sprinter must exert a horizontal force of 930 newtons to produce the given acceleration.