Explanation:
Downstream: you just sum the magnitude of the velocity vectors:
3km/h + 4km/h = 7km/h
Upstream: difference of the magnitudes of the velocity vectors, in absolute value:
|3km/h - 4km/h| = 1km/h
Acceleration = velocity / time.
Gamma: 4
Infrared: 1
X-Ray: 3
Visible Light: 2
Infrared has the longest wavelength between the four options, meaning that it has the lowest frequency. Since the longer the frequency, the lower the frequency. While the shorter the wavelength, the higher the frequency.
Next would be visible light since it has the second longest wavelength out of the given options. Then it would be X-Ray. And finally Gamma since it has the shortest wavelength.
Answer:
Explanation:
The work W required for the transfer is equal to the energy difference
![W = \Delta E = q \ \Delta V](https://tex.z-dn.net/?f=W%20%3D%20%5CDelta%20E%20%3D%20q%20%5C%20%5CDelta%20V)
where q is the charge we want to transfer and ΔV is the potential difference.
So, the work needed will be
![W = 9,000 \ C * 220 V](https://tex.z-dn.net/?f=W%20%3D%209%2C000%20%5C%20C%20%2A%20220%20V)
![W = 1,980,000 \ J](https://tex.z-dn.net/?f=W%20%3D%201%2C980%2C000%20%5C%20J)
Now, the average power is:
![< power > = \frac{work}{time}](https://tex.z-dn.net/?f=%3C%20power%20%3E%20%3D%20%5Cfrac%7Bwork%7D%7Btime%7D)
As the Watt is Joule/second, we need the 45 min multiplied by 60:
![time = 45 \ min * 60 \frac{s}{min}](https://tex.z-dn.net/?f=time%20%3D%2045%20%5C%20min%20%2A%2060%20%5Cfrac%7Bs%7D%7Bmin%7D)
![time = 2,700 \ s](https://tex.z-dn.net/?f=time%20%3D%202%2C700%20%5C%20s)
Taking all this together:
![< power > = \frac{1,980,000 \ J}{2,700 \ s}](https://tex.z-dn.net/?f=%3C%20power%20%3E%20%3D%20%5Cfrac%7B1%2C980%2C000%20%5C%20J%7D%7B2%2C700%20%5C%20s%7D)
![< power > = \frac{1,980,000 \ J}{2,700 \ s}](https://tex.z-dn.net/?f=%3C%20power%20%3E%20%3D%20%5Cfrac%7B1%2C980%2C000%20%5C%20J%7D%7B2%2C700%20%5C%20s%7D)
![< power > = 733.333 \ W](https://tex.z-dn.net/?f=%3C%20power%20%3E%20%3D%20733.333%20%5C%20W)
or
![< power > = 0.733 \ kW](https://tex.z-dn.net/?f=%3C%20power%20%3E%20%3D%200.733%20%5C%20kW)