Final answer:
The engine specific impulse in seconds can be calculated by dividing the engine thrust by the rate of fuel consumption.
Step-by-step explanation:
The engine specific impulse in seconds can be calculated by dividing the engine thrust by the rate of fuel consumption. Specific impulse is a measure of the efficiency of an engine in converting fuel into thrust. It represents the change in momentum per unit of propellant mass used.
For example, for an ion-propulsion rocket, the specific impulse in seconds would be calculated by dividing the change in velocity of the space probe by the mass of fuel expelled per second.
To calculate the specific impulse, you need information such as engine thrust, rate of fuel consumption, change in velocity, and mass of propellant expelled per second.