A block of mass m is lying on a horizontal surface of coefficient of friction u. A force F is applied to the block at an angle thita with the horizontal. The block will move with a minimum force F if
a. u= tan thita
b. u= cot thita
c. u= sin thita
d. u= cos thita
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In multicellular organisms, several cells are grouped to form tissues. These tissues perform particular function at a definite place in the body. For example, nerve cells from the nervous tissue which helps in transmission of messages. This is known as division of labour in multicellular organisms.
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