W = Force × Displacement × cosθ For work to be done, two conditions must be met: A force must act on the body. The body must be displaced in the direction of the force or a component of it.

When lifting the suitcase, the force applied is equal to its weight (mg) and the displacement is the height (h) of the table from the floor. Since the force and displacement are in the same direction(θ =0⁰), we get: Work ...

A and B experience the same buoyant force, the volume of water displaced by both must be equal. The volume of displaced water is equal to the volume of the submerged object. Thus, the volumes of metallic pieces A and ...

The smallest base area is breadth × width (800 cm²), meaning the maximum pressure is exerted in this case. Correct answer: (b) Maximum when breadth and width form the base. Class 9th Science NCERT MCQ Questions NCERT Books MCQ Questions ...

The atmosphere is held to the Earth by gravity (option a). Gravity keeps gases from escaping into space, maintaining the air we breathe. Without gravity, Earth’s atmosphere would dissipate, making life impossible. Class 9th Science NCERT MCQ Questions NCERT Books ...