What is fulcrum?

A rod of negligible mass carries a 5 kg mass at a distance of 10 cm from its fulcrum. Another mass m is kept 5 cm away on the other side such that the rod remains horizontal. Find the value of m and the reaction at the fulcrum.

The mass of a magnetic needle is 7.5 g and its magnetic moment is 98 units . To keep the magnetic needle horizontal in the northern hemisphere , what should be the position of its fulcrum with respect to its Centre of gravity ? Vertical component of earth's magnetic field = 0.25 Oe .

One end of a 600 cm long steel bar is fixed rigidly and the other end rests on a lever, 10 cm away from its fulcrum. The lever turns through 2^(@) when the bar is heated up to 50^(@)C. Find the increase in length of the bar and its coefficient of linear expansion.

What is the full form of PVC? What is its monomer? What is Marsh gas?

What is acrosome? What is its function?

What is haemocoel? What is alary muscle?

What is electron transport system? What are the site of respiration?

What are spermatheca ? Where they are situated ? What is the function of spermatheca ?

What are spermatheca? Where they are situated? What is the function of spermatheca?

What is Chloriosis? What is responsible for it?