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3 years ago

HELP ASAP!!!!!!! PLEASE WILL GIVE BRAINLIEST

1 answer:

7 0

Answer: The plasma membrane is called a selectively permeable membrane as it permits the movement of only certain molecules in and out of the cells. Not all molecules are free to diffuse. If plasma membrane ruptures or breaks down then molecules of some substances will freely move in and out of the cells.

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A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provid

Sergeeva-Olga [200]

Answer:

$8.37*10^5$ rpm

Explanation:

Given that rotational kinetic energy = $4.66*10^9J$

Mass of the fly wheel (m) = 19.7 kg

Radius of the fly wheel (r) = 0.351 m

Moment of inertia (I) = $\frac{1}{2} mr ^2$

Rotational K.E is illustrated as $(K.E)_{rt} = \frac{1}{2} I \omega^2$

$\omega = \sqrt{\frac{2(K.E)_{rt}}{I} }$

$\omega = \sqrt{\frac{2(KE)_{rt}}{1/2 mr^2} }$

$\omega = \sqrt{\frac{4(K.E)_{rt}}{mr^2} }$

$\omega = \sqrt{\frac{4*4.66*10^9J}{19.7kg*(0.351)^2} }$

$\omega = 87636.04$

$\omega = 8.76*10^4 rad/s$

Since 1 rpm = $\frac{2 \pi}{60} rad/s$

$\omega = 8.76*10^4(\frac{60}{2 \pi})$

$\omega = 836518.38$

$\omega = 8.37 *10^5 rpm$

3 0

3 years ago

Which of the following is a way in which earth material is returned to the surface?

kvv77 [185]

Answer:

Explanation:

soil

4 0

3 years ago

Read 2 more answers

What does it mean tha velocity is vector quantity

Wewaii [24]

It means that velocity not only has a size, but it also has a direction.

Some other vector quantities are force and acceleration.
They have sizes and directions.

Temperature, cost, and weight are quantities with only size and no direction.
Those are called "scalar" quantities.

7 0

3 years ago

How long does it take an airplane to fly 1200 miles if it maintains a speed of 300 miles per hour

sdas [7]

Answer:

The answer is

Explanation:

To find the time taken we use the formula

$t = \frac{d}{v} \\$

where

d is the distance covered

v is the velocity

t is the time

From the question

d = 1200 miles

v = 300 mi/hr

We have

$t = \frac{1200}{300} = \frac{12}{3} \\$

We have the final answer as

Hope this helps you

5 0

3 years ago

What was the change in internal energy (chemical energy plus thermal energy) of the person pulling the block?

enyata [817]

The historical method includes what steps?

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3 years ago