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3 years ago

1) Velocity is useful as a frame of reference

2 answers:

5 0

1) Velocity is useful as a frame of reference
True

2) Acceleration can be used as a frame of reference.
True

3) A frame of reference is important for comparison.
True

4) It does not compare two subjects and does not show direction and correlation.

5) It involves correlation.

6) A standard for comparison is called a frame of reference
True

7) Acceleration can be actually measured and compared
True

scoundrel [369]3 years ago

5 0

False , false , true

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the ph of a solution of HCl in water is found to be 2.50. what volume of water would you add to 1.00L of this solution to raise

morpeh [17]

Answer:

To raise the pH of the solution to 3.10 we have to add 2.34 L of water.

Explanation:

Given that the pH of the solution of HCl in water is 2.5. Here the solution’s pH is changing from 2.5 to 3.10 which means the acidic nature of the solution is decreasing here on dilution. $[H^+]$ ions contribute to a solution’s acidic nature and $[OH^-]$ contribute to a solution’s basic nature.

The equation connecting the concentration of $[H^+]$ and pH of a solution is pH= $-log[H^+]$

 $[H^+]= 10^(^-^p^H^)$ $[H^+]= 10^(^-^2^.^5^)=0.00316$ 

When the pH is $3.1 [H^+ ]= 10^(^-^3^.^1^)=0.000794$ 

On dilution the concentration of a solution decreases and volume increases.

 $M_1 V_1 = M_2 V_2$ 

 $0.00316 \times 1 = 0.000794 \times V_2$ 

 $V_2 = \frac{(0.00316 \times 1)}{0.000794} =3.24$ 

Volume of water to be added $=3.24-1$ 

 $=2.24L$ 

6 0

3 years ago

Why is some amount of cryolite added in the electrolysis of molten alumina

vesna_86 [32]

Answer:

A.It lowers the melting point of alumina. B.It increases the electrical conductivity. ... Hint: The solution of alumina and cryolite during the electrolysis gives the aluminium at cathode and oxygen at anode. The alumina is a poor conductor of electricity and the fusion temperature of alumina is about 2000∘C.

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3 years ago

The hydra is an organism that reproduces by growing another organism from the sie of its tubular body. What type of asexual repr

hichkok12 [17]

Answer:

Explanation:

budding

Figure 13.3 (a) Hydra reproduce asexually through budding: a bud forms on the tubular body of an adult hydra, develops a mouth and tentacles, and then detaches from its parent. The new hydra is fully developed and will find its own location for attachment.

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3 years ago

What is a limitation of solar power?

kodGreya [7K]

A is correct .

please vote my answer brainliest. thanks!

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3 years ago

which one of the following groups are decomposers a. algae b. protist c. fungi d. green plants e. photosynthetic bacteria?

Ludmilka [50]

Answer:

c. fungi

Explanation:

Decomposers are organisms that breaks down dead and decaying matter in nature. They derived their nourishment by breaking down other complex organic matter.

Fungi are a group of organisms that are mainly decomposers.

They recyclers in nature.

Green plants and photosynthetic bacteria are similar in that they obtain nourishment by the use of light to initiate the reaction between carbon dioxide and water.

Many protists are decomposers but not all.

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3 years ago