Answer:
the final velocity of the bus is -20 m/s.
Explanation:
Given;
initial velocity of the bus, u = 20 m/s
deceleration of the bus, -a = 8 m/s²
time of motion, t = 5 s
The final velocity of the bus is calculated as;
v = u + at
v = 20 + (-8 x 5)
v = 20 - 40
v = -20 m/s.
Therefore, the final velocity of the bus is -20 m/s.
Answer:
<h2>The answer is </h2><h2>A. slows heat flow.</h2>
Explanation:
An insulator is a material that impedes the movement of heat or electric current from flowing.
Theoretically good heat insulators stops the movement of heat, while practically this insulation can only be slowed down.
Hence from the options listed the correct answer practically is
<h2> A. slows heat flow.</h2>
Answer:
The value is ![x = 11.81 \ m](https://tex.z-dn.net/?f=x%20%3D%2011.81%20%5C%20m)
Explanation:
From the question we are told that
The height is h = 2.0 m
The height of the window is ![d = 9.0 \ m](https://tex.z-dn.net/?f=d%20%3D%209.0%20%5C%20m)
The initial velocity of the rock is ![u = 20 \ m/s](https://tex.z-dn.net/?f=u%20%3D%20%2020%20%5C%20m%2Fs)
The angle at which it is thrown is ![\theta = 40](https://tex.z-dn.net/?f=%5Ctheta%20%20%3D%20%2040)
Generally the vertical component of the velocity of the stone is mathematically represented as
![v_y = 20 sin (40)](https://tex.z-dn.net/?f=v_y%20%3D%2020%20sin%20%2840%29)
=>![v_y = 12.86 \ m/s](https://tex.z-dn.net/?f=v_y%20%3D%2012.86%20%5C%20m%2Fs)
Generally the height of the window from the ground is mathematically represented as using kinematic equation as
![d = h + v_yt + \frac{1}{2} gt^2](https://tex.z-dn.net/?f=d%20%3D%20h%20%20%2B%20%20v_yt%20%2B%20%5Cfrac%7B1%7D%7B2%7D%20gt%5E2)
=> ![9 = 2 +12.86 t + \frac{1}{2} * - 9.8 t^2](https://tex.z-dn.net/?f=9%20%3D%202%20%20%2B12.86%20t%20%2B%20%5Cfrac%7B1%7D%7B2%7D%20%2A%20-%209.8%20t%5E2)
Here g is negative -9.8 m/s^2 because the direction of the stone is against gravity
So
![4.9 t^2 -12.86 t + 7 =0](https://tex.z-dn.net/?f=4.9%20t%5E2%20-12.86%20t%20%2B%207%20%3D0)
Solving this quadratic equation using quadratic formula we obtain
t = 0.770 s
Generally the velocity of the stone on the x axis is mathematically represented as
![v_x = 20 * cos(40 )](https://tex.z-dn.net/?f=v_x%20%3D%20%2020%20%2A%20cos%2840%20%29)
=> ![v_x = 15.32 \ m/s](https://tex.z-dn.net/?f=v_x%20%3D%20%2015.32%20%5C%20%20m%2Fs)
Generally the distance between the person throwing the rock and the window is mathematically represented as
![x = v_x * t](https://tex.z-dn.net/?f=x%20%3D%20%20v_x%20%2A%20t)
=> ![x = 15.32 * 0.771](https://tex.z-dn.net/?f=x%20%3D%20%2015.32%20%2A%200.771)
=> ![x = 11.81 \ m](https://tex.z-dn.net/?f=x%20%3D%2011.81%20%5C%20m)
Answer : the first product for carbon dioxide is C2CNT. Product: Carbon nanotubes, carbon fiber. the second product for hydrogen is fertilizer. a product for oxygen is water. the reactants of carbon dioxide is carbon dioxide (CO2), water (H2O), and usable energy. the reactants of hydrogen is Both hydrogen and oxygen gases exist as diatomic (“two-atom”) molecules. the reactants of oxygen is oxygen gas and the 2 in front of the water vapor are called the reaction coefficients.
Explanation: your welcome everyone!