Answer
Given,
Flow rate of river is equal to 300,000 L/s.
Width of river = 18 m
and depth of river = 22 m
a) Average speed of river
Q = 300,000 L/s
= 300 m³/s
Q = Av
![v = \dfrac{Q}{A}](https://tex.z-dn.net/?f=v%20%3D%20%5Cdfrac%7BQ%7D%7BA%7D)
![v = \dfrac{300}{18 \times 22}](https://tex.z-dn.net/?f=v%20%3D%20%5Cdfrac%7B300%7D%7B18%20%5Ctimes%2022%7D)
![v = \dfrac{300}{396}](https://tex.z-dn.net/?f=v%20%3D%20%5Cdfrac%7B300%7D%7B396%7D)
![v = 0.757\ m/s](https://tex.z-dn.net/?f=v%20%3D%200.757%5C%20m%2Fs)
b) Average speed when river is widen to 63 m and depth is increased to
![v = \dfrac{Q}{A}](https://tex.z-dn.net/?f=v%20%3D%20%5Cdfrac%7BQ%7D%7BA%7D)
![v = \dfrac{300}{63 \times 42}](https://tex.z-dn.net/?f=v%20%3D%20%5Cdfrac%7B300%7D%7B63%20%5Ctimes%2042%7D)
![v = \dfrac{300}{2646}](https://tex.z-dn.net/?f=v%20%3D%20%5Cdfrac%7B300%7D%7B2646%7D)
![v = 0.113\ m/s](https://tex.z-dn.net/?f=v%20%3D%200.113%5C%20m%2Fs)
Answer:
B. objects remain in the same state of motion unless a force acts on them
Explanation:
Sana nakatulong
Answer:
1} Two 100 lb. tanks of Oxygen
2) Five gallons of water
3) Food concentrate
4) One case dehydrated milk
5) Solar-powered heater
6) Solar-powered receiver-transmitter
7} First aid kit
8) Box of matches
9) Stellar map
10) Magnetic compass
11) Two 45 caliber pistols
12) Signal flares
13) 50' of rope
14) Self-inflating life raft
15) Parachute silk
Answer:
![2.41 \times 10^{13}\ free\ electrons/cm^3](https://tex.z-dn.net/?f=2.41%20%5Ctimes%2010%5E%7B13%7D%5C%20free%5C%20electrons%2Fcm%5E3)
Explanation:
given,
free electron per atom = 5.6 x 10⁻¹⁰
density of silicon = 5.32 g/cm³
molar mass of silicon = 72.59 g/mol
number of moles per cubic centimeter
= ![\dfrac{5.32}{72.59}\ mole/cm^3](https://tex.z-dn.net/?f=%5Cdfrac%7B5.32%7D%7B72.59%7D%5C%20mole%2Fcm%5E3)
number of atom per cubic centimeter
= ![\dfrac{5.32}{72.59}\times 6.022 \times 10^{23}\ /cm^3](https://tex.z-dn.net/?f=%5Cdfrac%7B5.32%7D%7B72.59%7D%5Ctimes%206.022%20%5Ctimes%2010%5E%7B23%7D%5C%20%2Fcm%5E3)
number of free electron per cubic centimeter
= ![\dfrac{5.32}{72.59}\times 6.022 \times 10^{23}\times 5.6 \times 10^{-10}/cm^3](https://tex.z-dn.net/?f=%5Cdfrac%7B5.32%7D%7B72.59%7D%5Ctimes%206.022%20%5Ctimes%2010%5E%7B23%7D%5Ctimes%205.6%20%5Ctimes%2010%5E%7B-10%7D%2Fcm%5E3)
= ![2.41 \times 10^{13}\ free\ electrons/cm^3](https://tex.z-dn.net/?f=2.41%20%5Ctimes%2010%5E%7B13%7D%5C%20free%5C%20electrons%2Fcm%5E3)