Speed is a description of how fast an object moves; velocity is how fast and in what direction it moves. In physics, velocity is speed in a given direction. When we say a car travels at 60 km/h, we are specifying its speed.
Force required is 100 N
<u>Given that;</u>
Rate of acceleration = 5 m/s²
Mass of object = 20kg
<u>Find:</u>
Force required
<u>Computation:</u>
Force = Mass × Acceleration
Force required = Rate of acceleration × Mass of object
Force required = 20 × 5
Force required = 100 N
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Answer:
![R=803k\Omega](https://tex.z-dn.net/?f=R%3D803k%5COmega)
Explanation:
We have the following information,
![V_0 = 12V\\V=10V\\c= 1.25*10^{-6}F\\t=1.8s](https://tex.z-dn.net/?f=V_0%20%3D%2012V%5C%5CV%3D10V%5C%5Cc%3D%201.25%2A10%5E%7B-6%7DF%5C%5Ct%3D1.8s)
We apply the equation for capacitor charging the voltage across it,
![V=V_0 (1-e^{-t/x})\\e^{-t/x}=1-(\frac{V}{V_0})\\-\frac{t}{Rc}=ln(\frac{V}{V_0})\\R=-\frac{t}{ln(\frac{V}{V_0})*c}](https://tex.z-dn.net/?f=V%3DV_0%20%281-e%5E%7B-t%2Fx%7D%29%5C%5Ce%5E%7B-t%2Fx%7D%3D1-%28%5Cfrac%7BV%7D%7BV_0%7D%29%5C%5C-%5Cfrac%7Bt%7D%7BRc%7D%3Dln%28%5Cfrac%7BV%7D%7BV_0%7D%29%5C%5CR%3D-%5Cfrac%7Bt%7D%7Bln%28%5Cfrac%7BV%7D%7BV_0%7D%29%2Ac%7D)
Replacing values,
![R=-\frac{1.8}{ln(10/12)*1.25*10^{-6}}](https://tex.z-dn.net/?f=R%3D-%5Cfrac%7B1.8%7D%7Bln%2810%2F12%29%2A1.25%2A10%5E%7B-6%7D%7D)
![R=803k\Omega](https://tex.z-dn.net/?f=R%3D803k%5COmega)
Answer:
the ice became smaller and turned to liquid because of the absorption of heat from the surrounding of the ice cube which makes it to change its form from solid to liquid
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