Final answer:
The total force resisting the motion of the car, boat, and trailer is 990 N. The friction force developed between the tires of the truck and the road can be calculated using the equation Ffriction = μN.
Step-by-step explanation:
To determine the constant horizontal force developed in the coupling C, we need to calculate the total force resisting the motion of the car, boat, and trailer. We can use Newton's second law, which states that force equals mass times acceleration (F = ma). The mass of the car, boat, and trailer combined is 1800 kg (1100 kg + 700 kg). The acceleration is 0.550 m/s². Therefore, the total force resisting the motion is 990 N (1800 kg * 0.550 m/s²).
To determine the friction force developed between the tires of the truck and the road during this time, we need to consider the force of friction. The force of friction can be calculated using the equation Ffriction = μN, where μ is the coefficient of friction and N is the normal force. In this case, the normal force is equal to the weight of the truck, which can be calculated as the mass of the truck times the acceleration due to gravity (9.8 m/s²). Assuming the coefficient of friction is 0.62 (as given in the example), the friction force can be calculated as Ffriction = 0.62 * (1800 kg * 9.8 m/s²).