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timama [110]
3 years ago
9

PLEASE ANSWER ASAP!!!

Physics
1 answer:
Mice21 [21]3 years ago
3 0

The total momentum of the system has to be conserved to satisfy the principle of conservation of momentum. Before the ball hits the bottle, the momentum of the system is 0.4 x 18 = 7.2 kg m/s

The momentum of the bottle after being hit is 0.2 x 25 = 5 kg m/s

So the momentum of the ball now is 7.2 - 5 = 2.2 kg m/s

Hence its velocity is 2.2/0.4 = 5.5 m/s

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Cars A and B are racing each other along the same straight road in the following manner:
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Answer:

\frac{x_{o}}{v_B-V_A} =t

Explanation:

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x_o= "head start"

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"cathching up means" that x_A(t)=x_B(t)

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Which statement best describes the difference between a substance with a pH of 3.0 and a substance with a pH of 6.0?
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The statement best describes the difference between a substance with a pH of 3.0 and a substance with a pH of 6.0 is - The substance with the lower pH has 1,000 times as many hydrogen ions per volume of water.

pH is the scale or measure for the substance about its acidic or basic strength. It ranges from 0 to 6.9 which is acidic and 7.1 to 14 which is basic.

Acidic substance has high concentration of Hydrogen ions whereas, basic substance has low concentration of hydrogen ions, however for the OH⁻ ions it is reverse.

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pH = -log(H^{+}) then,  

=> 3 = -log (H^{+})

=> H^{+} =  (for pH = 3)  

=> pH = -log(H^{+})

=> 6 = -log (H^{+})

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Learn more about pH scale:

brainly.com/question/1596421

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