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Ganezh [65]
3 years ago
7

Two test tubes are filled with a solution of bromthymol blue. A student exhales through a straw into each tube, and the bromthym

ol blue turns yellow. An aquatic green plant is placed in each tube, and the tubes are corked. One tube is placed in the dark, and the other tube is placed in direct sunlight. The yellow solution in the tube in sunlight turns blue, while the one in the dark remains yellow. Which statement best explains why the solution in the tube placed in sunlight returns to a blue color
Physics
1 answer:
saw5 [17]3 years ago
8 0

Answer:

oxygen was produced by phosynthesis

Explanation:

kkkkk

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An inductor is connected to the terminals of a battery that has an emf of 12.0 V and negligible internal resistance. The current
algol13

Answer:

R = 2481 Ω  

L= 1.67 H

Explanation:

(a) We have an inductor L which has an internal resistance of R. The inductor is connected to a battery with an emf of E = 12.0 V. So this circuit is equivalent to a simple RL circuit. It is given that the current is 4.86 mA at 0.725 ms after the connection is completed and is 6.45 mA after a long time. First we need to find the resistance of the inductor. The current flowing in an RL circuit is given by

i = E/R(1 -e^(-R/L)*t)                                                   (1)

at t --> ∞ the current is the maximum, that is,  

i_max = E/R

solve for R and substitute to get,  

R=  E/i_max

R = 2481 Ω  

(b) To find the inductance we will use i(t = 0.940 ms) = 4.86 mA, solve (1) for L as,  

Rt/L = - In (1  - i/i_max )

Or,  

L = - Rt/In (1  - i/i_max )

substitute with the givens to get,

L = -(2481 Si) (9.40 x 10-4 s)/ In (1  - 4.86/6.45 )  

L= 1.67 H

<u><em>note :</em></u>

<u><em>error maybe in calculation but method is correct</em></u>

8 0
2 years ago
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A panpipe is made of five pipes. The longest pipe is 25 centimeters long
Marysya12 [62]
The pipe that produces the highest-frequency sound is the 5 cm long pipe. 

According to the Fundamental Principle, the length of the tube of the pipe and its frequency is inversely proportional. 

This means that the longer the tube, the lower the frequency and vice versa. Therefore, between the 25cm long pipe and the 5cm long pipe, the shorter pipe produces the highest-frequency sound.
7 0
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Supposed an object is weighted with a spring balance, first in air then while totally immersed in water.The readings on the bala
Sedbober [7]
Is An object completely submerged in a fluid displaces its own volume of fluid ". This is: D
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An athlete runs 200 m by running 100 m in a straight line and then turning around and running 100m back to the start point.
siniylev [52]

Answer:

o

Explanation:

The athlete ran a total distance of zero because they ran 100m forward then turned around so they went back to their starting position

6 0
3 years ago
What is the name for the area of dust and debris which orbited the young sun and eventually became planets and moons?
alexandr402 [8]
I believe the answer is C. protoplanetary disc. Let me know if this helps
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