Physics Past Questions and Answers

I. Jet propelled aircraft
II. Rocket propulsion
III. The recoil of a gun
IV. A person walking
Which of the above is based on Newton's third law of motion

In a hydraulic press , a force of 40N is applied on the effort piston of area 0.4m². If the force exerted on the load piston is 400N, the area of the large piston is

A 100kg box is pushed along a road with force of 500N. If the box moves with a uniform velocity, the coefficient of friction between the box and the road is

As the pressure of a fluid increases, its viscosity

the diagram above shows forces 4N, 6N, 10N and 8N which act at a point O in the directions indicated. the net horizontal force is