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3 years ago

What protists do not have definite shape

Physics

1 answer:

enyata [817]3 years ago

6 0

Amoeba

Explanation:A type of protozoan that does not have a definite shape. It moves by using pseudo pods (false feet).

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Consider two particles A and B. The angular position of particle A, with constant angular acceleration, depends on time accordin

Doss [256]

Answer:

$t - t_1 = \frac{-\omega_o + \sqrt{\omega_o^2 + 8\alpha(2\omega_o t + \alpha t^2)}}{4\alpha}$

Explanation:

After time "t" the angular position of A is given as

$\theta_a = \theta_o + \omega_o t + \frac{1}{2}\alpha t^2$

now we know that B start motion after time t1

so its angular position is also same as that of position of A after same time "t"

so we have

$\theta_b = \theta_o + \frac{\omega_o}{2} (t - t_1) + \frac{1}{2}(2\alpha) (t - t_1)^2$

now since both positions are same

$\theta_a = \theta_b$

$\omega_o t + \frac{1}{2}\alpha t^2 = \frac{\omega_o}{2}(t - t_1} + \alpha(t - t_1)^2$

$2\omega_o t + \alpha t^2 = \omega_o(t - t_1) + 2\alpha(t - t_1)^2$

$t - t_1 = \frac{-\omega_o + \sqrt{\omega_o^2 + 8\alpha(2\omega_o t + \alpha t^2)}}{4\alpha}$

3 0

3 years ago

Explain why there is total internal reflection in an optical fibres

Harlamova29_29 [7]

The optical fibers are thin, thus, the light entering from one side of the wire surface has more chances to reflect back from the inside surface due to the larger angle of incidence.

The angle of the strike is large due to the small size of the wire and this angle is greater than the critical angle.

As the angle of the incident light on the inside surface is greater than the critical angle, thus, the total internal reflection of the takes place.

Hence, there are more chances of total internal reflection of light inside the optical fiber wire than the emergence of light through the wire.

6 0

1 year ago

Steam is leaving a pressure cooker whose operating pressure is 20 psia. It is observed that the amount of liquid in the cooker h

Debora [2.8K]

Answer:

a) 34.05ft/s

b).1156.2BTU/lbm

c) 2.04BTU/s

Explanation:

Amount of liquid that has evaporated, m = ◇Vliq/ Vf

We replace the values to make conversion

m = (0.6gal/ 0.01683ft^3/lbm) × (0.13368ft^3/1gal)

m = 4.755lb

The mass flow rate of exit steam is given by:

m' = m/◇t

We replace values to make conversion

m' =( 4.766lb/45min) = 0.1059lb/min × 1min/60s

m' = 0.001765lb/s

The exit velocity V = m'/pA = m'Vg/A

We replace values to make conversion

V =[ (0.001765lbm/s)(20.093ft^3/lbm) /(0.15 in^2)]× (144in^2/1ft^2)

V = 34.05ft/s

b) The total and flow energies per unit mass is given by:

Eflow= Pv = h - u

We replace the values to make conversion

Eflow = 1156.2 - 1081.8

Eflow = 74.4BTU/lbm

Therefore theta= h + ke + pe

Theta approximately =h = 1156.2BTU/lbs

c) The rate at which energy is leaving the cooler by steam is given by:

Emass = m'theta

Emass = (0.001765)×(1156.2)

Emass = 2.04BTU/s

6 0

4 years ago

A system of satellites, base stations, and receivers is called ___________.

Nookie1986 [14]

A system of satellites, base stations, and receivers is called<span> global positioning system. </span><span>GPS, which stands for </span>Global Positioning System, is a radio navigation system that allows land, sea, and airborne users to determine their exact location, velocity, and time 24 hours a day, in all weather conditions, anywhere in the world. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

8 0

3 years ago

Which of the following is the best way to make a conclusion? A. The experiment must be manipulated until the results show what y

Genrish500 [490]

Answer:

Explanation:

You should compare your results and data with your original hypothesis. It is okay to have a hypothesis that was shown to be false. That's science. Things do not always work out. You can always discuss what you could have done differently and things that went wrong. There is no right answer in science!

7 0

3 years ago