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## End of chapter exercises

A heavy rope is flicked upwards, creating a single pulse in the rope. Make a drawing of the rope and indicate the following in your drawing:

1. The direction of motion of the pulse

2. Amplitude

3. Pulse length

4. Position of rest

A pulse has a speed of 2,5 m·s−1. How far will it have travelled in 6 s?

 $\text{distance}$ $=\text{speed}×\text{time}$ $=\left(2,5m\cdot {s}^{-1}\right)×\left(6s\right)$ $=15m$

A pulse covers a distance of 75 cm in 2,5 s. What is the speed of the pulse?

 $\text{speed}$ $=\frac{\text{distance}}{\text{time}}$ $=\frac{75cm}{2,5s}$ $=30cm\cdot {s}^{-1}=0,30m\cdot {s}^{-1}$

How long does it take a pulse to cover a distance of 200 mm if its speed is 4 m·s−1?

 $\text{speed}$ $=\frac{\text{distance}}{\text{time}}$ $\text{time}$ $=\frac{\text{distance}}{\text{speed}}$ $=\frac{200mm}{4m\cdot {s}^{-1}}$ $=\frac{0,2m}{4m\cdot {s}^{-1}}$ $=0,05s$