Physics
Answer
The position of the centre of gravity of a body depends mainly on two factors:
- Shape of the body
- Distribution of mass in the body
Explanation:
The position of the centre of gravity depends on the shape of the body and on how its mass is distributed.
For example, two rods may have the same shape and size, but if one rod is uniform and the other is heavier at one end, their centres of gravity will be at different positions.
Related Questions
An atom of lithium contains 3 electrons, 3 protons and 4 neutrons. Its mass number is:
- 3
- 4
- 7
- 10
Complete the following by choosing the correct answers from the bracket:
(a) A car is moving in uniform circular motion. The direction of friction between the tyres and the path is …………… [towards the centre / tangential to the path].
(b) When a ray of light passes from a denser to a rarer medium, its wavelength …………… [decreases / increases].
(c) The lid of a calorimeter minimises heat loss by …………… [convection / radiation].
(d) Quality of sound depends on its …………… [amplitude / waveform].
(e) A substance whose resistance becomes almost negligible at a temperature near absolute zero is called a …………… [semiconductor / superconductor].
(f) …………… radiation deviates minimum in a magnetic field [Alpha / Beta].
Case 1: Lata cuts a potato into two halves, using a cutter which belongs to a Class II lever. She needed effort E1.
Case 2: Then she cuts one half of this potato again, but this time she needed effort E2. If E1 > E2 then:
(a) In which case (1st or 2nd) was the potato closer to her hand applying the effort? (Assume normal reaction of the surface of the potato is same in both cases)
(b) Give a reason for your answer in (a) above.
The graph below shows the variation of image distance (v) with the object distance (u) when an object is kept in front of a lens.
(a) Identify the type of lens used.
(b) What would be the magnification (more than 1 / less than 1 / equal to 1) if the object is placed between F and 2F of the above lens?