Physics
(a) When does the nucleus of an atom tend to become radioactive?
(b) Name a single pulley in which displacement of load and effort is not the same.
(c) State one advantage of this pulley.
Related Questions
Small air bubbles rising up a fish tank appear silvery when viewed from some particular angle is due to the:
- reflection
- refraction
- dispersion
- total internal reflection
When a ray of light travels normal to the given surface, then the angle of refraction is:
- 180°
- 90°
- 0°
- 45°
(a) What is the position of centre of gravity of a triangular lamina?
(b) When this triangular lamina is suspended freely from any one vertex, what is the moment of force produced by its own weight in its rest position?
The diagram shows wheel O pivoted at point A. Three equal forces F1, F2 and F3 act at point B on the wheel.
(a) Which force will produce maximum moment about A?
(b) Give a reason for your answer in (a).