The Earth pulls on the Moon with an average force of 2.0×10^20 N. (A number that is literally astronomically large.) The Moon in turn pulls on the Earth with a force of _____ N.

Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 94.5 N,94.5 N, Jill pulls with 88.1 N88.1 N in the northeast direction, and Jane pulls to the southeast with 181 N.181 N. (Since the donkey is involved with such uncoordinated people, who can blame it for being stubborn?)   Find the magnitude of the net force the people exert on the donkey.   What is the direction of the net force? Express this as the angle from the east direction between 0°0° and 90°,90°, with a positive sign for north of east and a negative sign for south of east.

Two teams of nine members each engage in a tug of war. Each of the first team's members has an average mass of 72 kg and exerts an average force of 1350 N horizontally. Each of the second team's members has an average mass of 77 kg and exerts an average force of 1373 N horizontally.   (a) What is the acceleration (in m/s2 in the direction the heavy team is pulling) of the two teams?

The magnitude and direction exerted by two tugboats towing a ship are 1670 kilograms, N30°W, and 1260 kilograms, S50°W, respectively. Find the magnitude, in kilograms, and the direction angle, in degrees, of the resultant force.

The launch thrust of the Space Shuttle’s rocket engines is approximately 3.47×107 N. If the Shuttle’s launch mass is about 2.00×106 kg, what is the acceleration at liftoff? I know that F net =F thrust, so the opposing but equal force is - mg F net = F thrust - mg m = 2.00 x 10^6 kg F net = N = 2.00 x 10^6 (9.8) =mg, expressed as N is 1.96x107 N =  3.47×107 N (up) - 1.96x107 N (down) then...

An antelope is being pulled by two forces whose vector-component expressions are: F1 = 3.6Ni + -8.9Nj + -3.7Nk F2 = 8.2Ni + -1.7Nj + 2.4Nk What is the angle (in degrees) between these two vectors?

A 83.2 kg person is standing inside an elevator. The elevator is moving upward at 2.54 m/s and is decreasing speed at a rate of 1.82 m/s^2. What is the normal force that is acting on the person?

Two people are pushing a truck across a parking lot. The truck has a mass of about 2 × 103 kg. First, they take turns pushing. When Person A pushes the truck, the truck accelerates at a rate of 1 m/s2. When Person B pushes the truck, it accelerates at a rate of 2 m/s?. (a) Both people stand behind the truck and push in the same direction. What is the net force on the truck? At what rate will the truck accelerate? (b) Person A stands at the back of the truck and Person B stands at the front, and they push in opposite directions. What is the net force on the truck? At what rate will the truck accelerate? In what direction? For both (a) and (b), draw a picture indicating the forces applied by A and B as well as the motion of the truck.

Two teams of nine members each engage in a tug of war. Each of the first team’s members has an average mass of 61 kg and exerts an average force of 1359 N horizontally. Each of the second team’s members has an average mass of 73 kg and exerts an average force of 1363 N horizontally.  (a) What is the acceleration of the two teams? Give this as a positive value. (b) What is the tension in the section of rope between the teams?