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...

... 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 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 ...

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.. ...

Newton's Laws of Motion: Friction. ... The force exerted by the man is applied at an angle of 30 ... a) Draw a free-body diagram of the system showing all forces in the ...

... Problems: 1. There may be forces acting on the car ... Neglecting friction, only force that acts on the surfer ... Hence, applying Newton's second law (F = ma) we have ...

... Fnet , of the sum of all forces acting on ... B) Find the magnitude, Fww , of the force that the ... step by step to illustrate application of Newton's laws of motion. ...

... It is an example of Newton's third law as it ... of the following interactions, identify the action and reaction forces: ... Action Force: Hammer pushes the nail down. ...

... Now the forces acting on the hammer The weight of ... on the hammerhead F2 Hence the resultant force on the ... F2 = 4.9 + 15.0 + F2 According to Newton's second law...