La densidad del metal disminuye a medida que se calienta . Piense en el agua . Cuando hace frío , se convierte en hielo , lo cual es muy densa . Cuando hace calor , se evapora en gas , que no es denso.
<span>Espero que esto no es confuso , yo no soy un hablante nativo de español .</span>
Answer:
Train wheels and rails are both made of steel, and the steel-steel friction coefficient is around 0.25. As a result, the stopping time and distance will be three to four times that of a car.
Answer:
Power generated = 1,000W
Explanation:
Given
Mass, m= 60kg
Distance, d = 10m
Time, t = 6s
To calculate Power, First we need to get the total work done
Work done is calculated by multiplying force by distance;
Taking acceleration due to gravity as ![10\frac{m}{s^{2}}](https://tex.z-dn.net/?f=10%5Cfrac%7Bm%7D%7Bs%5E%7B2%7D%7D)
Force = mg
Force = 60 * 10
Force = 600N
So, Work = Force * Distance
Work = 600N * 10m
Work = 6000Nm or 6000J
Power is calculated by ![\frac{Work}{Distance}](https://tex.z-dn.net/?f=%5Cfrac%7BWork%7D%7BDistance%7D)
By Substitution
Power = ![\frac{6000}{6}](https://tex.z-dn.net/?f=%5Cfrac%7B6000%7D%7B6%7D)
Power = 1000W
Without knowing anything about their magnitudes or directions, the only thing you can always say about thier combination is that it's the "net force" on the object.
Chronic stress can physically change the brain by:
- Chronic stress has the ability to shrink the
brain. It has the ability to harm one’s person learning capacity by being able
to reduce the volume of the gray matter that is a major component in a person’s
brain. It is also able to harm the memory of the person.