Travel to the stars requires hundreds or thousands of years, even at the speed of light. Some people have suggested that we can get around this difficulty by accelerating the rocket (and its astronauts) to very high speeds so that they will age less due to time dilation. The fly in this ointment is that it takes a great deal of energy to do this. Suppose you want to go to the immense red giant Betelgeuse, which is about 500 light-years away. You plan to travel at constant speed in a 1000 kg rocket ship (a little over a ton), which, in reality, is far too small for this purpose.

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Chapter1: Units, Trigonometry. And Vectors
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**Educational Content on Space Travel and Time Dilation**

**Overview:**

Travel to the stars requires hundreds or thousands of years, even at the speed of light. Some suggest overcoming this by accelerating rockets and their astronauts to very high speeds, thus reducing aging due to time dilation. However, immense energy is required for these speeds. For instance, traveling to the red giant Betelgeuse, about 500 light-years away, poses significant energetic constraints.

**Calculations and Exercises:**

**Part H: Energy Requirement**
- **Task:** Calculate the energy needed if the rocket ship's speed is 0.990c, expressed as a percentage of the U.S. yearly use of energy (1.0 × 10²⁰ joules).
- **Expression:** \( E = \quad \% \) of the U.S. yearly use of energy

**Part I: Time for Earth Observers**
- **Task:** Determine the time for the trip, as perceived by people on Earth, if the rocket ship's speed is 0.9999c. 
- **Expression:** \( t_{\text{Earth}} = \quad \text{yr} \)

**Part J: Time for Astronauts**
- **Task:** Calculate the trip time from the astronauts' perspective on the rocket ship at a speed of 0.9999c.
- **Expression:** \( t_{\text{Rocket}} = \quad \text{yr} \)

These exercises involve understanding relativistic effects, such as time dilation, and their implications on space travel.
Transcribed Image Text:**Educational Content on Space Travel and Time Dilation** **Overview:** Travel to the stars requires hundreds or thousands of years, even at the speed of light. Some suggest overcoming this by accelerating rockets and their astronauts to very high speeds, thus reducing aging due to time dilation. However, immense energy is required for these speeds. For instance, traveling to the red giant Betelgeuse, about 500 light-years away, poses significant energetic constraints. **Calculations and Exercises:** **Part H: Energy Requirement** - **Task:** Calculate the energy needed if the rocket ship's speed is 0.990c, expressed as a percentage of the U.S. yearly use of energy (1.0 × 10²⁰ joules). - **Expression:** \( E = \quad \% \) of the U.S. yearly use of energy **Part I: Time for Earth Observers** - **Task:** Determine the time for the trip, as perceived by people on Earth, if the rocket ship's speed is 0.9999c. - **Expression:** \( t_{\text{Earth}} = \quad \text{yr} \) **Part J: Time for Astronauts** - **Task:** Calculate the trip time from the astronauts' perspective on the rocket ship at a speed of 0.9999c. - **Expression:** \( t_{\text{Rocket}} = \quad \text{yr} \) These exercises involve understanding relativistic effects, such as time dilation, and their implications on space travel.
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