Answer:
The answer is <u>C</u>
Explanation:
Light is a substance through which particles flow from a light source
Just took the quiz on edge.
Answer:
, 6.1 s
Explanation:
The motion of the dropped penny is a uniformly accelerated motion, with constant acceleration
![g=5.3 ft/s^2](https://tex.z-dn.net/?f=g%3D5.3%20ft%2Fs%5E2)
towards the ground. If the penny is dropped from a height of
![h_0 = 100 ft](https://tex.z-dn.net/?f=h_0%20%3D%20100%20ft)
the vertical position of the penny at time t is given by the equation
![h(t) = h_0 - \frac{1}{2}gt^2](https://tex.z-dn.net/?f=h%28t%29%20%3D%20h_0%20-%20%5Cfrac%7B1%7D%7B2%7Dgt%5E2)
where the negative sign is due to the fact that the direction of the acceleration is downward.
We want to know the time t at which the penny reaches the ground, which means h(t)=0. Substituting into the equation, it becomes
![0=h_0 - \frac{1}{2}gt^2](https://tex.z-dn.net/?f=0%3Dh_0%20-%20%5Cfrac%7B1%7D%7B2%7Dgt%5E2)
And re-arranging it, we find an expression for the time t:
![t=\sqrt{\frac{2h_0}{g}}](https://tex.z-dn.net/?f=t%3D%5Csqrt%7B%5Cfrac%7B2h_0%7D%7Bg%7D%7D)
And substituting the numbers, we can also find the numerical value:
![t=\sqrt{\frac{2(100 ft)}{5.3 ft/s^2}}=6.1 s](https://tex.z-dn.net/?f=t%3D%5Csqrt%7B%5Cfrac%7B2%28100%20ft%29%7D%7B5.3%20ft%2Fs%5E2%7D%7D%3D6.1%20s)
Answer:
when Metallic oxide reacts with water they form metallic hydroxide which are basic in nature