In humans, which part of the brain contains 80 percent of its weight? cerebrum cerebellum spiral cord brain stem

Cerebrum

Explanation:

Human brain is defined as  the centralized organ of the human nervous system and the spinal cord is connected to the central nervous system.

The cerebrum, brainstem, and the cerebellum are the main parts of human brain. Out of these the cerebrum is the largest part of the human brain which consists or can say that which is divided into two cerebral hemisphere.

Outer layer of grey matter which is present in cerebrum is known as cerebral cortex and this cortex covers the white matter. Then the cortex is further divided into neocortex and the allocortex.

So, because of the largest part of the brain it covers approximately 80 percent of human weight.

Therefore, cerebrum is the part of human brain which consists 80 percent of its weight.

i don't understand. explain it clearly

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.