The net external force on the propeller of a 3.9 kg model airplane is 6.8 N forward.
What is the acceleration of the airplane?
To find the acceleration of the airplane, you can use Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net external force acting on it and inversely proportional to its mass.
The formula for calculating acceleration is:
acceleration (a) = net external force (F) / mass (m)
Given that the net external force on the propeller is 6.8 N forward and the mass of the model airplane is 3.9 kg, you can plug these values into the formula to find the acceleration:
acceleration (a) = 6.8 N / 3.9 kg = 1.74 m/s²
Therefore, the acceleration of the airplane is 1.74 m/s².