I hope this helps. it was right when i took the test.
What is one effect of steroid abuse in professional sports?
AThey cause athletes to stop training hard incorrect answer
BThey allow some competitors to gain an unfair advantage incorrect answer
CThey cause athletes to stop competing to win incorrect answer
DThey cause athletes to become selfish
Answer:
200 km/hr
Explanation:
Since he goes 80km per hour, multiply this by 2.5 or two and a half hours.
80 x 2.5 = 200 km/hr.
Answer:
Explanation:
From the given information:
The speed of a synchronous motor in relation to its frequency can be represented with the formula:
![n_{sm}= \dfrac{120f_{se}}{P}](https://tex.z-dn.net/?f=n_%7Bsm%7D%3D%20%5Cdfrac%7B120f_%7Bse%7D%7D%7BP%7D)
where,
the electrical frequency
is measured in Hz
the number of poles = P
For us to estimate the number of poles to have 50 Hz - 60 Hz Power, then we need to relate the frequencies of the above equation.
i.e
![\dfrac{120(50 \ Hz)}{P_1}= \dfrac{120( 60 \Hz)}{P_2} \\ \\ \dfrac{6000 \ Hz}{P_1}= \dfrac{7200 \ Hz}{P_2} \\ \\ \dfrac{P_2}{P_1}=\dfrac{7200}{6000} \\ \\ \\ \dfrac{P_2}{P_1}= \dfrac{12}{10}](https://tex.z-dn.net/?f=%5Cdfrac%7B120%2850%20%5C%20Hz%29%7D%7BP_1%7D%3D%20%5Cdfrac%7B120%28%2060%20%5CHz%29%7D%7BP_2%7D%20%5C%5C%20%5C%5C%20%5Cdfrac%7B6000%20%5C%20Hz%7D%7BP_1%7D%3D%20%5Cdfrac%7B7200%20%5C%20Hz%7D%7BP_2%7D%20%5C%5C%20%5C%5C%20%5Cdfrac%7BP_2%7D%7BP_1%7D%3D%5Cdfrac%7B7200%7D%7B6000%7D%20%5C%5C%20%5C%5C%20%5C%5C%20%5Cdfrac%7BP_2%7D%7BP_1%7D%3D%20%5Cdfrac%7B12%7D%7B10%7D)
Thus, we can conclude that 10 poles synchronous motor is attached with 12 poles synchronous generator in order to convert 50 Hz to 60 Hz power.