Muscle times speed equals power. What does muscle stand for?

Options

A. momentum
B. kinetic energy
C. thrust
D. pressure

Answer

To solve the question "Muscle times speed equals power. What does muscle stand for?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Equation**: The equation given is "Muscle times speed equals power". This can be mathematically represented as:
\[ M \times V = P \]
where \( M \) represents muscle, \( V \) is speed, and \( P \) is power.

2. **Identify the Formula for Power**: We know from physics that power can also be defined as the rate of doing work. The formula for power is:
\[ P = \frac{dW}{dt} \]
where \( W \) is work done.

3. **Relate Work to Force and Displacement**: The work done \( W \) can be expressed in terms of force \( F \) and displacement \( s \):
\[ W = F \times s \]
Therefore, the power can be rewritten as:
\[ P = \frac{d(F \times s)}{dt} \]

4. **Apply the Chain Rule**: Using the chain rule, we can express the power as:
\[ P = F \times \frac{ds}{dt} \]
where \( \frac{ds}{dt} \) is the velocity \( V \).

5. **Final Power Formula**: Thus, we can simplify this to:
\[ P = F \times V \]

6. **Compare with the Given Equation**: Now, we can compare this derived formula \( P = F \times V \) with the original equation \( M \times V = P \). From this comparison, we can see that:
\[ M = F \]

7. **Conclusion**: Therefore, we conclude that "muscle" stands for "force".

### Final Answer:
Muscle stands for force.