Which impulse class corresponds to a total impulse of 320 Newton-seconds?

Which impulse class corresponds to a total impulse of 320 Newton-seconds?

• A. "H"
• B. "I"
• C. "J"
• D. "K"

Answer: (A)

Total impulse classes group rockets by the total impulse produced during a burn, measured in Newton-seconds. Each class covers a specific range. A total impulse of 320 N·s sits at the upper limit of the class that spans 160–320 N·s. Since 320 N·s falls within that range, it belongs to that class. The next class starts just above 320 N·s, so anything greater would move up. So the impulse class for 320 N·s is the one that ends at 320 N·s.

Total impulse classes group rockets by the total impulse produced during a burn, measured in Newton-seconds. Each class covers a specific range. A total impulse of 320 N·s sits at the upper limit of the class that spans 160–320 N·s. Since 320 N·s falls within that range, it belongs to that class. The next class starts just above 320 N·s, so anything greater would move up. So the impulse class for 320 N·s is the one that ends at 320 N·s.