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SOLUTION TO EXERCISE 6
SOLUTION TO EXERCISE 6 The diameter of the cylinder-shaped tail is 10,000 km, so its volume is 3.14 * (5000 km * 100,000 cm / km)^2 * (length of tail). The number density of the tail is 10,000 molecules per cubic centimeter, so another way to express the volume is 3.1 * 10^34 / 10,000 = 3.1 * 10^30 cm^3. Thus, the length of the tail is 3.1 * 10^30 cm^2 L = -------------------- = 3.9 * 10^12 cm = 3.9 * 10^7 km. 3.14 * (5 * 10^8)^2 This is 39000000/12756 = 3100 times longer than Earth's diameter. Very long. |