Module 20: Coordinates for Time - Exercise 1a & 1b - World Science U

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Module 20: Coordinates for Time – Exercise 1a & 1b

final exam

Module 20: Coordinates for Time – Exercise 1a & 1b

Question 1 of 2

1. Question
George and Gracie are a million light-years apart, but not moving relative to one another. George determines that two firecrackers, one located next to him, and the other 1/3 of the way toward Gracie explode at exactly the same moment. From Gracie’s perspective, which firecracker explodes first?
- 1. The firecracker closest to her.
- 2. The firecracker closest to George.
- 3. They explode at the same moment.
- 4. Not enough information to answer.
Correct

Incorrect
Question 2 of 2

2. Question
George and Gracie are 100,000 light-years apart, but not moving relative to one another. George determines that two firecrackers, one located next to him, and the other 1/3 of the way toward Gracie explode 3 seconds apart, with the one closest to him exploding first. From Gracie’s perspective, which firecracker explodes first, and by how many seconds?
- 1. The firecracker closest to her explodes 3 seconds before the other.
- 2. The firecracker closest to George explodes 3 seconds before the other.
- 3. They explode at the same moment.
- 4. Not enough information to answer.
Correct

Incorrect

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