Answer:
The upper motor neurons synapse in the spinal cord connect with anterior horn cells of lower motor neurons, usually via interneurons. The anterior horn cells are the cell bodies of the lower motor neurons and are located in the grey matter of the spinal cord.
Explanation:
Interneurons are the central nodes of neural circuits, enabling communication between the upper motor neurons, sensory or motor neurons located in the brain and spinal cord and they send signals to lower motor neurons or central nervous system (CNS) in the brain stem and spinal cord . When they get a signal from the upper motor neurons, they send another signal to your muscles to make them contract. They play vital roles in reflexes, neuronal oscillations, and neurogenesis in the adult mammalian brain.
Renshaw cells are among the very first identified interneurons. They are excited by the axon collaterals of the motor neurons. In addition, Renshaw cells make inhibitory connections to several groups of motor neurons.
Answer:
The work done by gravity is ![4.975 \: Joules](https://tex.z-dn.net/?f=4.975%20%5C%3A%20Joules)
Explanation:
The data given in the question is :
Mass is ![0.245 kg](https://tex.z-dn.net/?f=0.245%20kg)
Height from ground is ![2.07 m](https://tex.z-dn.net/?f=2.07%20m)
As we know , the work done is state function , it depends on initial and final position not on the path followed.
So, work done by gravity = change in potential energy
Work done = Initial potential energy - final potential energy
Insert values from question
Work done = ![mass \times gravity \times (change \: in \: height)](https://tex.z-dn.net/?f=mass%20%5Ctimes%20gravity%20%5Ctimes%20%28change%20%5C%3A%20in%20%5C%3A%20height%29)
Work done = ![0.245 kg \times 9.81 m/s^{2} \times 2.07 m](https://tex.z-dn.net/?f=0.245%20kg%20%5Ctimes%209.81%20m%2Fs%5E%7B2%7D%20%5Ctimes%202.07%20m)
So, work done = ![4.975 Joules](https://tex.z-dn.net/?f=4.975%20Joules)
Hence the work done by gravity is ![4.975 \: Joules](https://tex.z-dn.net/?f=4.975%20%5C%3A%20Joules)
Answer:
Heat of reaction or enthalpy of reaction (ΔH)
Explanation:
The heat of reaction or enthalpy of reaction (ΔH) is the amount of heat energy that the system must release or absorb so that the temperature remains constant throughout the chemical reaction process. In other words, the heat of reaction or enthalpy of reaction (ΔH) is the change in the enthalpy of a chemical reaction (the energy absorbed or released into it) that occurs at a constant pressure.
Then, this energy can be observed in the following way:
Every substance has a quantity of energy stored in its links. When the energy contained in the reagents is greater than that contained in the products, the reaction is exothermic because energy release occurs. When the energy contained in the reagents is less than that contained in the products, an endothermic reaction occurs because energy absorption occurs.
That energy contained in the substances is called enthalpy (H).
Then the enthalpy can be defined as the difference between the sum of the enthalpies of the products and the sum of the enthalpies of the reactants.
The acceleration of gravity in low Earth orbit is a fraction smaller than it is on the Earth's surface, like maybe 15% less.
The astronauts feel no gravity at all, because they and everything around them are constantly falling.
Its an example of negative acceleration since the car is decelerating to approach the stop sign