Answer :
Final answer:
Explanation of the concepts of weight and mass and how they relate to gravity and gravitational forces. None of the option is correct.
Explanation:
Weight vs. Mass: Weight is a force measured in newtons (N), while mass is the amount of matter in an object measured in kilograms (kg).
The magnitude of the gravitational force of the Earth on Roy: Weight = mass * acceleration due to gravity. Therefore, the weight of Roy is 60 kg * 9.8 m/s^2 = 588 N.
The magnitude of Roy's gravitational force on the Earth: According to Newton's third law, the gravitational force of Roy on Earth is equal in magnitude and opposite in direction to the gravitational force of Earth on Roy, so it is also 588 N.
The magnitude of the gravitational force between Roy and Laurie: Use Newton's law of universal gravitation: F = (G * m1 * m2) / r^2. Plug in the values to find the force.
