Physics
The moment of a force of 20 N about a point O is 18 N-m. Find the distance of point of application of the force from the point O.
Related Questions
(a) Write the two uses of radioactivity.
(b) A crow-bar of length 80 cm has its fulcrum situated at a distance of 10 cm from the load. Calculate the mechanical advantage of the crow-bar.
(c) Why fission nuclei undergo β-decay?
A person standing 22 m away from a wall produces a sound and receives the reflected sound.
(a) In what time interval, he receives the reflected sound, if speed of sound in air is 330 ms-1 ?
(b) At which distance should he stand to receive the sound in 0.12 s?
Define the term 'centre of gravity of a body'.
The diagram below shows a lever in use:
(a) To which class of levers does it belong?
(b) Without changing the dimensions of the lever, if the load is shifted towards the fulcrum, what happens to the mechanical advantage of the lever?