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3 years ago

11

Scientists primarily attribute global warming to artificial increases in which greenhouse gas?

1 answer:

dimaraw [331]3 years ago

7 0

Scientists primarily attribute global warming to artificial increases to the greenhouse gas carbon dioxide. According to NASA, carbon dioxide levels have increase to nearly 38 percent as of 2009 due to the burning of fossil fuels, cutting down carbon-absorbing forests.

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Some bacteria are propelled by motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velo

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Answer :

(a) The angular speed of this bacterial motor is $1.6\times 10^3s^{-1}$

(b) The time taken by the motor to make one revolution is $3.9\times 10^{-3}s$

Explanation :

(a) To determine the angular speed of this bacterial motor.

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$\omega=\frac{v}{r}$

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$\omega=\frac{2.1\times 10^{-5}m/s}{1.3\times 10^{-8}m}$

$\omega=1.6\times 10^3s^{-1}$

Thus, the angular speed of this bacterial motor is $1.6\times 10^3s^{-1}$

(b) to determine the time taken by the motor to make one revolution.

Formula used :

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Now put all the given values in this formula, we get:

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