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3 years ago

What is average speed???

Physics

1 answer:

alina1380 [7]3 years ago

7 0

Answer:

total distance dibide by total time

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I WILL GIVE BRAINLIEST....<br>Determine the value of F...

aleksley [76]

F should be 10. If The Whole top is 50cm, then we should subtract 10n and 30n which gives us 10.

Or it could be 15 if both top and bottom are 25. 10+15= 25.

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3 years ago

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

Can someone help please I’ll mark brainless

morpeh [17]

Answer:

Synthesis Reaction

Explanation:

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Pepsi [2]

Wouldn’t it be 1. resistance is high compared to the voltage and with less resistance, higher current

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3 years ago

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A mechanic pushes a 2.60 ✕ 103-kg car from rest to a speed of v, doing 5,430 J of work in the process. During this time, the car

Oduvanchick [21]

Part A. We are given that a car is pushed from rest to a final speed doing 5430 Joules of work. -

To determine the final velocity we will use the work and energy theorem which states that the work done is equal to the change in kinetic energy:

$W=K_f-K_0$

Since the car starts from rest this means that the initial kinetic energy is zero:

$W=K_f$

The kinetic energy is given by:

$K=\frac{1}{2}mv^2$

Substituting in the formula we get:

$W=\frac{1}{2}mv_f^2$

Now, we solve for the final velocity. First, we multiply both sides by 2 and divide both sides by the mass:

$\frac{2W}{m}=v_f^2$

Now, we take the square root to both sides:

$\sqrt{\frac{2W}{m}}=v_f$

Now, we plug in the values:

$\sqrt{\frac{2(5430J)}{2.6\times10^3kg}}=v_f$

Solving the operations:

$2.04\frac{m}{s}=v_f$

Therefore, the final velocity is 2.04 m/s.

Part B. Now, we use the following formula for work:

$W=Fd$

Where "F" is the force and "d" is the distance.

Now, we set this equation equal to the work done by the force:

$Fd=5430J$

Now, we divide both sides by the distance "d":

$F=\frac{5430J}{29m}=187.2N$

Therefore, the force exerted is 187.2 Newton.

7 0

2 years ago

What is average speed???​

What is average speed???