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3 years ago

A cell is classified as eukaryotic if the cell

Physics

2 answers:

oee [108]3 years ago

7 0

b- contains a nucleus

bezimeni [28]3 years ago

5 0

Eukaryotic cells contain membrane-bound organelles, including a nucleus.Prokaryotic cells<span> do not contain a nucleus or any other membrane-bound organelle. i think thats the answer but if im wrong im sorry</span>

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Energy that a microwave use to heat food?

yanalaym [24]

Electromagnetic energy

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3 years ago

A disk, with a radius of 0.25 m, is to be rotated like a merry-go-round through 800 rad, starting from rest, gaining angular spe

torisob [31]

Answer:

a) $T_{min} = 80\,s$

Explanation:

a) Let consider that disk accelerates and decelerates at constant rate. The expression for angular acceleration and deceleration are, respectively:

Acceleration

$\alpha_{1} = \frac{\omega_{max}^{2}}{2\cdot (400\,rad)}$

Deceleration

$\alpha_{2} = -\frac{\omega_{max}^{2}}{2\cdot (400\,rad)}$

Since angular acceleration and deceleration have same magnitude but opposite sign. Let is find the maximum allowed angular speed from maximum allowed centripetal acceleration:

$a_{r,max} = \omega_{max}^{2}\cdot r$

$\omega_{max} = \sqrt{\frac{a_{r,max}}{r} }$

$\omega_{max} = \sqrt{\frac{100\,\frac{m}{s^{2}} }{0.25\,m} }$

$\omega_{max} = 20\,\frac{rad}{s}$

Maximum magnitude of acceleration/deceleration is:

$\alpha = 0.5\,\frac{rad}{s^{2}}$

The least time require for rotation is:

$T_{min} = 2\cdot \left(\frac{20\,\frac{rad}{s} }{0.5\,\frac{rad}{s^{2}} } \right)$

$T_{min} = 80\,s$

3 0

3 years ago

2 Points

vesna_86 [32]

Answer:

A. Sound comes from the ball every time it bounces.

B. The ball is warmer after it stops bouncing than it was before it

started bouncing

Explanation:

It is evidently shown that the ball shown energy transformation because it produces sound at each bounce and also becomes warmer after the bounce.

The law of conservation of energy suggests that energy is neither created nor destroyed but transformed from one form to another.

a bouncing ball produces sound energy at each bounce. This is conversion of potential energy initially of the ball into kinetic energy of sound.
Also, the motion of the ball produces kinetic energy which causes the ball to warm up, this is thermal energy.
We see that a ball originally with potential energy has yielded the kinetic forms of energy which are sound and thermal energy.

3 0

4 years ago

If frequency increases, then wavelength _________.

marshall27 [118]

Answer

decreases

Explanation

Frequency and wavelength are inversely proportional to each other. And if wavelength increases, its frequency decreases.

7 0

3 years ago

Read 2 more answers

A lens of focal length 0.1 m is placed 0.08 m away from a bug. Where does the image of the bug appear to be (i.e., what is the i