Answer:
Stephen hawking if his family were scientists
Boron Group
elements have three valence electrons and are fairly reactive. All of them are solids at room temperature. Boron is a very hard, black metalloid with a high melting point.
Answer:
The percentage power lost in the transmission line if the voltage not stepped up is 50%.
Explanation:
Given that,
Current = 60 A
Voltage = 120 V
Resistance = 1.0 ohm
We need to calculate the power
Using formula of power
![P=I\times V](https://tex.z-dn.net/?f=P%3DI%5Ctimes%20V)
Where,I =current
V = voltage
Put the value into the formula
![P=60\times120](https://tex.z-dn.net/?f=P%3D60%5Ctimes120)
![P=7200\ W](https://tex.z-dn.net/?f=P%3D7200%5C%20W)
We need to calculate the percentage power lost in the transmission line
If the voltage is not stepped up
Then, the power loss
![P'=I^2\times R](https://tex.z-dn.net/?f=P%27%3DI%5E2%5Ctimes%20R)
Put the value into the formula
![P'=(60)^2\times1](https://tex.z-dn.net/?f=P%27%3D%2860%29%5E2%5Ctimes1)
![P'=3600\ W](https://tex.z-dn.net/?f=P%27%3D3600%5C%20W)
The percentage power loss P''
![P''=\dfrac{P'}{P}\times100=\dfrac{3600}{7200}\times100](https://tex.z-dn.net/?f=P%27%27%3D%5Cdfrac%7BP%27%7D%7BP%7D%5Ctimes100%3D%5Cdfrac%7B3600%7D%7B7200%7D%5Ctimes100)
![P''=50\%](https://tex.z-dn.net/?f=P%27%27%3D50%5C%25)
Hence, The percentage power lost in the transmission line if the voltage not stepped up is 50%.
Fill in the fraction: 3,600/90 = 40; turn it into a unit fraction.
40 mi/min
F = m • a
What we know:
- Gravity: 9.8 m/s
- Force: 490 N
Equation derived:
m = F/a
m = 490/9.8
= 50 kg