Physics
A uniform metre ruler is balanced horizontally on a knife edge placed at 60 cm mark when a mass m is suspended from 75 cm mark. Draw the diagram of the arrangement. State with reason (through mathematical steps) whether the mass of the scale is greater than, less than or equal to the mass m?
Related Questions
An object is placed at a distance of 10 cm from a convex lens of focal length 20 cm.
(a) Find the position of the image.
(b) What is the nature of the image?
(a) Name the electromagnetic radiations which are used for sterilising water in a water purifier.
(b) State any one property of the radiations mentioned by you in part (a).
(c) Why are the danger signals red in colour?
State the energy conversions taking place:
(a) during photosynthesis
(b) in a thermocouple
(c) during bursting a cracker
An inclined plane makes an angle of 30° with the horizontal as shown in the figure. A box of mass 20 kg is taken from point A to point B along the inclined plane of length 2 m.
(a) Calculate the potential energy gained by the box.
(b) If 10 J of work is done against friction, in moving the box from A to B then calculate the force F needed to pull the block from A to B. [g = 10 m s-2]