a) Approximately how long would it take a telephone signal to travel 3070 mi from coast to coast across the United States? (Telephone signals travel at about the speed of light.)
The speed of light is approximately 186,282 miles per second. To calculate the time it would take for a telephone signal to travel 3070 miles, we can use the formula:
time = distance / speed
time = 3070 miles / 186,282 miles per second
time ≈ 0.0165 seconds
Therefore, it would take approximately 0.0165 seconds for a telephone signal to travel 3070 miles from coast to coast across the United States.