### Spacetime Diagrams and 4-Momentum Vectors#### Question 1:**Indicate ALL the spacetime diagrams with worldlines that are physically realizable:**a)- Diagram with a straight line moving upwards diagonally from left to right.b)- Diagram with a right-angled path moving up then horizontally to the right.c)- Diagram with a zigzag path moving up and down repeatedly.d)- Diagram with a bent line starting up then sharply turning right and continuing diagonally.e)- None of these. **Answer:**- **Realizable Diagrams:** a) and d)#### Question 2:**Which of these 4-momentum vectors represent an object with mass? Indicate all that apply:**a) \[ \begin{bmatrix}5\, \text{kg} \\0 \\0 \\-3\, \text{kg}\end{bmatrix} \]b)\[ \begin{bmatrix}3\, \text{kg} \\3\, \text{kg} \\0 \\0\end{bmatrix} \]c)\[ \begin{bmatrix}5\, \text{kg} \\0 \\0 \\-5\, \text{kg}\end{bmatrix} \]d)\[ \begin{bmatrix}3\, \text{kg} \\0 \\0 \\0\end{bmatrix} \]e)\[ \begin{bmatrix}5\, \text{kg} \\0 \\3\, \text{kg} \\0\end{bmatrix} \]f)\[ \begin{bmatrix}5\, \text{kg} \\0 \\0 \\-5\, \text{kg}\end{bmatrix} \]**Answer:**- **Represent an Object with Mass:** a), b), d), e)#### Question 3:**A 1 meter stick with a speed of 4/5 moves past an observer. In the observer’s reference frame, how long does it take the stick to completely pass the observer?**a) 1.6 nsb) 2.5 nsc) 4.2 nsd) 2.0 ns

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Answered: 1. Indicate ALL the spacetime diagrams…

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1. Indicate ALL the spacetime diagrams with worldlines that are physically realizable: a) b) d) e) None of these LL MY * (s) x (s) c) t(s) x (s)