Final answer:
The normal force on an 800-kg car with two 55-kg passengers is calculated by summing the mass of the car and passengers and multiplying by the acceleration due to gravity, resulting in a normal force of 8918 N.
Step-by-step explanation:
The question seeks to determine the normal force acting on an 800-kg car with two 55-kg people sitting inside. To calculate this, we must first find the total weight of the car and the passengers, which is the sum of the mass of the car, the mass of the two passengers, and then multiply by the acceleration due to gravity (9.8 m/s²).
The total mass is 800 kg + 2 × 55 kg = 910 kg. The weight, which is equal to the normal force when the car is on a flat surface and no other vertical forces are acting, is 910 kg × 9.8 m/s² = 8918 N.
Therefore, the normal force, which supports the car and its occupants against gravity, is 8918 N.