A Train Traveling Very Fast (V = 0

question 12

Multiple Choice

A train traveling very fast (v = 0.6c) has an engineer (E) at the front, a guard (G) at the rear and an passenger (S') exactly half way between them. Both E and G are equipped with yellow signaling lamps. The train passes a station, closely observed by the station master (S) . Both E and G use their lamps to send signals. According to both S and S' these signals arrive simultaneously at the instant S' is passing S. According to S, the signal from E will look ______ and that from G will look _____:

• A) red, blue
• B) yellow, yellow
• C) blue, red
• D) blue, blue
• E) red, red

---

Definitions:

Two Variables

A situation or analysis involving two distinct factors or elements that may or may not influence each other.

Positive Correlation

A relationship between two variables in which both variables move in the same direction, indicating that as one variable increases, the other also increases.

Exam Scores

Numerical or letter grades assigned to evaluate a student's performance on an examination.

Amount Julie Sleeps

A specific measure of sleep duration, possibly used in studies to correlate sleep with other variables.