Assuming 50% efficiency, 150 kcals of chemical energy would result in of kinetic energy. a. 50 kcals b. 75 kcals c. 100 kcals d. 150 kcals

Here we have to calculate the kinetic energy obtained by the body

As per the question the total amount of chemical  energy is 150 kilo calorie

The efficiency is given as 50%

Before going to solve this first we have to know about the meaning of efficiency.

The efficiency of a substance is the fraction of output energy i.e the ratio of output energy energy to the input energy.

Mathematically we may write efficiency ouput/input

   As per the question input chemical energy =150 kilo calorie

The efficiency =50% i.e 1/2

Hence output kinetic energy [K.E]=input chemical energy ×

                                                       = 150 kilo calorie×1/2

                                                       =75 kilo calorie [ANS]

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

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