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3 years ago

Which is faster a velocity of + 3 m /s or -4 m / s

Physics

1 answer:

irina1246 [14]3 years ago

7 0

Answer: Velocity of 3m is the faster

Explanation: Velocity of 3m is the faster because velocity of -4m goes in an opposite direction to positive velocities

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

Anestetic [448]

Answer:

(a) $\omega=1.41*10^3\frac{rad}{s}$

(b) $t=4.46*10^{-3}s$

Explanation:

The angular speed is a measure of the rotation speed. Thus, It is defined as the angle rotated by a unit of time:

$\omega=\frac{\theta}{t}(1)$

The arc length in a circle is given by:

$s=r\theta\\\theta=\frac{s}{r}(2)$

s is the length of an arc of the circle, so $v=\frac{s}{t}$ .

Replacing (2) in (1):

$\omega=\frac{s}{t}\frac{1}{r}\\\omega=\frac{v}{r}$

a) Now, we calculate the angular speed:

$\omega=\frac{2.21*10^{-5}\frac{m}{s}}{1.57*10^{-8}m}\\\omega=1.41*10^3\frac{rad}{s}$

b) We use (1) to calculate the time it takes to make one revolution, which means that $\theta$ is $2\pi$ .

$\omega=\frac{\theta}{t}\\t=\frac{\theta}{\omega}\\t=\frac{2\pi}{1.41*10^3\frac{rad}{s}}\\t=4.46*10^{-3}s$

8 0

3 years ago

Puzzle 3

Hunter-Best [27]

Answer:

hagcsgdufgeuwuwgsgwhajisydcbeek

Explanation:

edowooooooww

4 0

4 years ago

Helppppppppppppppppppp

adell [148]

Answer:

Explanation:

smh man do better this is too easy

6 0

3 years ago

Read 2 more answers

What creates voltage difference in a battery?

Ksenya-84 [330]

Electrolyte is a chemical medium that allows the flow of electrical charge between the cathode and anode.

4 0

3 years ago

an electric device is plugged into a 110v wall socket. if the device consumes 500 w of power, what is the resistance of the devi

andreev551 [17]

Answer: R=24.2Ω

Explanation: Power is rate of work being done in an electric circuit. It relates to voltage, current and resistance through the following formulas:

P=V.i

P=R.i²

$P=\frac{V^{2}}{R}$

The resistance of the system is:

$P=\frac{V^{2}}{R}$

$R=\frac{V^{2}}{P}$

$R=\frac{110^{2}}{500}$

R = 24.2Ω

For the device, resistance is 24.2Ω.

4 0

3 years ago