When a petrol engine doesn't start, we pull the choke button converted to the choke plate of carburettor. What does it do?

When we touch a hot plane unknowingly then this heat is sensed by a receptor P present in oyr fingers. The receptor triggers an impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a tissue U in our arm. The tissue U then contracts and pulls or hand away from the hot plate. (a) What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R? (b) What is (i) neuron S, and (ii) neuron T? (c) Name the tissue U. (d) What name is given to the phenomeon in which hand is pulled quickly from the hot plate? (e) Name the effector in this whole process.

A model rocket rests on a frictionless horizontal surface and is joined by a string of length l to a fixed point so that the rocket moves in a horizontal circular path of radius l . The string will break if its tensiion exceeds a value T . The rocket engine provides a thrust F of constant magnitude along the rocket's direction of motion. the rocket has a mass m that does not change with time. Answer the following questions based on the above passage. What distance does the rocket travel between the time t_(1) when the string breaks and the time 2t_(1) ? The rocket engine continues of operate after the string breaks.

Two friends were in the forest, when they saw a bear coming towards them. Frightened, the older boy, quickly climbed a tree, forgetting his friend. The younger boy, who couldn't climb well, threw himself down on the ground and pretended to be dead. The bear came and circled around the body. He put his face close to that of the boy. He sniffed and stared and at last left. The older boy came down the tree, ran to his friend and asked," Are you all right? What was the bear doing? He was near you for a long time." "He was talking to me", replied his friend, "He gave me some good advice." He said, "Don't trust a friend who doesn't help you in the time of danger." Who proved to be clever in the story?

Two friends were in the forest, when they saw a bear coming towards them. Frightened, the older boy, quickly climbed a tree, forgetting his friend. The younger boy, who couldn't climb well, threw himself down on the ground and pretended to be dead. The bear came and circled around the body. He put his face close to that of the boy. He sniffed and stared and at last left. The older boy came down the tree, ran to his friend and asked," Are you all right? What was the bear doing? He was near you for a long time." "He was talking to me", replied his friend, "He gave me some good advice." He said, "Don't trust a friend who doesn't help you in the time of danger." The moral of the story is :

Two friends were in the forest, when they saw a bear coming towards them. Frightened, the older boy, quickly climbed a tree, forgetting his friend. The younger boy, who couldn't climb well, threw himself down on the ground and pretended to be dead. The bear came and circled around the body. He put his face close to that of the boy. He sniffed and stared and at last left. The older boy came down the tree, ran to his friend and asked," Are you all right? What was the bear doing? He was near you for a long time." "He was talking to me", replied his friend, "He gave me some good advice." He said, "Don't trust a friend who doesn't help you in the time of danger." The older boy climbed a tree because :

Two friends were in the forest, when they saw a bear coming towards them. Frightened, the older boy, quickly climbed a tree, forgetting his friend. The younger boy, who couldn't climb well, threw himself down on the ground and pretended to be dead. The bear came and circled around the body. He put his face close to that of the boy. He sniffed and stared and at last left. The older boy came down the tree, ran to his friend and asked," Are you all right? What was the bear doing? He was near you for a long time." "He was talking to me", replied his friend, "He gave me some good advice." He said, "Don't trust a friend who doesn't help you in the time of danger." 'Pretended to be dead' means:

Two friends were in the forest, when they saw a bear coming towards them. Frightened, the older boy, quickly climbed a tree, forgetting his friend. The younger boy, who couldn't climb well, threw himself down on the ground and pretended to be dead. The bear came and circled around the body. He put his face close to that of the boy. He sniffed and stared and at last left. The older boy came down the tree, ran to his friend and asked," Are you all right? What was the bear doing? He was near you for a long time." "He was talking to me", replied his friend, "He gave me some good advice." He said, "Don't trust a friend who doesn't help you in the time of danger." The bear did not harm the younger boy because:

At t=0 , a body starts from origin with some initial velocity. The displacement x(m) of the body varies with time t(s) as x=-(2//3)t^2+16t+2 . Find the initial velocity of the body and also find how long does the body take to come to rest? What is the acceleration of the body when it comes to rest?