Answer:
Q = 12540 J
Explanation:
It is given that,
Mass of water, m = 50 mL = 50 g
It is heated from 0 degrees Celsius to 60 degrees Celsius.
We need to find the energy required to heat the water. The formula use to find it as follows :
![Q=mc\Delta T](https://tex.z-dn.net/?f=Q%3Dmc%5CDelta%20T)
Where c is the specific heat of water, c = 4.18 J/g°C
Put all the values,
![Q=50\times 4.18\times (60-0)\\Q=12540\ J](https://tex.z-dn.net/?f=Q%3D50%5Ctimes%204.18%5Ctimes%20%2860-0%29%5C%5CQ%3D12540%5C%20J)
So, 12540 J of energy is used to heat the water.
Answer:
320 N/m
Explanation:
From Hooke's law, we deduce that
F=kx where F is applied force, k is spring constant and x is extension or compression of spring
Making k the subject of formula then
![k=\frac {F}{x}](https://tex.z-dn.net/?f=k%3D%5Cfrac%20%7BF%7D%7Bx%7D)
Conversion
1m equals to 100cm
Xm equals 25 cm
25/100=0.25 m
Substituting 80 N for F and 0.25m for x then
![k=\frac {80}{0.25}=320N/m](https://tex.z-dn.net/?f=k%3D%5Cfrac%20%7B80%7D%7B0.25%7D%3D320N%2Fm)
Therefore, the spring constant is equal to 320 N/m
Answer:
No, not necessarily
Explanation:
If an object is moving with an acceleration that causes its speed to be reduced, there will be a moment in which it reaches v = 0, but this doesn't necessarily mean that the acceleration isn't acting anymore. If the object continues its movement with the same acceleration, it's velocity will become negative.
An example of an object that has zero velocity but non-zero acceleration:
If you throw an object in the air with a certain velocity, it will move vertically, reducing its velocity in a 9,8
rate (which is the acceleration caused by gravity). At a certain point, the object will reach its maximum height, and will start to fall. In the exact moment that it reaches the maximum height, before it starts falling, its velocity is zero, but gravity is still acting on the object (this is the reason why it starts falling instead of just being stopped at that point). Therefore, at that point, the object has zero velocity but an acceleration of 9,8
.
Answer:
.
Explanation:
Sound waves are caused by vibration ripples in water are caused by disturbance in the molecules
Closer than the outer planets, inside the Asteroid Belt between Mars and Jupiter.