If the average thrust of a motor is 100 Newtons and the burn time is 4 seconds, what is the total impulse?

To determine the total impulse generated by a rocket motor, you can use the formula for impulse, which is the product of average thrust and burn time. Specifically, it can be expressed as:

Total Impulse = Average Thrust × Burn Time

In this case, the average thrust is given as 100 Newtons, and the burn time is 4 seconds. When you perform the calculation:

Total Impulse = 100 N × 4 s = 400 Newton-seconds

This leads us to conclude that the total impulse of the motor is 400 Newton-seconds. Thus, the correct answer reflects the proper application of the impulse formula, making it clear how the total impulse is derived from the provided thrust and burn time values. It's essential to understand that total impulse is a critical parameter in rocketry, as it provides insight into the overall performance of the rocket motor during its operation.