1. An airplane has a mass of 3.1 X 104 kg and takes off under the influence of a constant net force of 3.7 X 104 N. What is the net force that acts on the plane's 78-kg pilot?

3. In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 45 m/s (about 100 mi/h) in a time of 7.0 s. The mass of the car and riders is 5.5 X 103 kg. Find the average net force exerted on the car and riders by the magnets.

19. On earth, two parts of a space probe weigh 11 000 N and 3400 N. These parts are separated by a center-to-center distance of 12 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the other out in space, far from any other objects.

25. The mass of a robot is 5450 kg. This robot weighs 3620 N more on planet A than is does on planet B. Both planets have the same radius of 1.33 X 107 m. What is the difference MA - MB in the masses of these planets?

Solution Summary

This post provides step by step calculations for net force, magnitude of gravitational force, and masses of planets.

... gravitational, normal, static and kinetic/frictional forces, tension force), equilibrium and non-equilibrium applications of Newton's laws of motion...

... The two forces acting, the weight and the friction ... direction is positive) According to Newton's second law... Hence the average net force during the interval is ...

... As per Newton's third law, the forces of action ... balance each other (both being internal forces of the ... the horizontal direction as no external force is acting ...

Newton's Law of Motion: Contact Force and Acceleration. ... The forces are shown in the diagram. Let N is the contact force between the two and the acceleration of ...

...Newton's second law of motion: According to this law "the rate of change of linear momentum of a body is directly proportional to the external force applied on ...

... start to accelerate with an acceleration given by Newton's second law : a = Net force/Mass = (F ... Now let us consider the forces acting on the upper block. ...

Newton's Laws of Motion: Slipping vs. ... (Note: static friction force has magnitude f ≤ μsN). Solution: a) Forces acting on the brick are shown in the fig.. ...