The equation to work out the speed is distance/time.
If we apply this equation to your numbers we will first need to find the total distance travelled.
80km/h for an hour means you travel 80km
40km/h for 2 hours means you will travel 80km
80+80 is 160km in total.
The time taken to complete this distance is 3 hours so, applying the equation we get
speed = 160/3 = 52.33km/h
Explanation:
Given that,
Initial speed of the electron, ![u=4\times 10^5\ m/s](https://tex.z-dn.net/?f=u%3D4%5Ctimes%2010%5E5%5C%20m%2Fs)
Distance, s = 5 cm = 0.05 cm
Acceleration of the electron,
(a) Let v is the electron's velocity when it emerges from this region. It can be calculated as :
![v^2=u^2+2as](https://tex.z-dn.net/?f=v%5E2%3Du%5E2%2B2as)
![v^2=(4\times 10^5)^2+2\times 6\times 10^{12}\times 0.05](https://tex.z-dn.net/?f=v%5E2%3D%284%5Ctimes%2010%5E5%29%5E2%2B2%5Ctimes%206%5Ctimes%2010%5E%7B12%7D%5Ctimes%200.05)
v = 871779.788 m/s
or
![v=8.71\times 10^5\ m/s](https://tex.z-dn.net/?f=v%3D8.71%5Ctimes%2010%5E5%5C%20m%2Fs)
(b) Let t is the time for which the electron take to cross the region. It can be calculated as:
![t=\dfrac{v-u}{a}](https://tex.z-dn.net/?f=t%3D%5Cdfrac%7Bv-u%7D%7Ba%7D)
![t=\dfrac{8.71\times 10^5-4\times 10^5}{6\times 10^{12}}](https://tex.z-dn.net/?f=t%3D%5Cdfrac%7B8.71%5Ctimes%2010%5E5-4%5Ctimes%2010%5E5%7D%7B6%5Ctimes%2010%5E%7B12%7D%7D)
![t=7.85\times 10^{-8}\ s](https://tex.z-dn.net/?f=t%3D7.85%5Ctimes%2010%5E%7B-8%7D%5C%20s)
Hence, this is the required solution.
Answer:
11 m/s
Explanation:
The motion of the box is a uniformly accelerated motion (=constant acceleration), therefore we can use the following suvat equation:
![v=u+at](https://tex.z-dn.net/?f=v%3Du%2Bat)
where:
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time
For the box in this problem, we have:
u = 3 m/s is the initial velocity
is the acceleration
t = 4 s is the time interval
Solving for v, we find the velocity after 4 seconds:
![v=3+(2)(4)=11 m/s](https://tex.z-dn.net/?f=v%3D3%2B%282%29%284%29%3D11%20m%2Fs)
Potassium: K
Copper: Cu
Chlorine: Cl
i hope this is what you’re asking for
Answer:
through nuclear fusion
Explanation:
The burning of the sun is not chemical combustion. It is nuclear fusion. This combustion releases energy which we experience as the heat and light given off by the flame.