When an electric current is passed through water during the process of electrolysis two gases are formed one gas has a boiling point of -183 c and the other has a boiling point of -253 change or a chemical change occurred explain had a physical change or a chemicial change occurred explain?

Answers

Answer 1

Answer:

There is a chemical change because the liquid water, after passing an electric current, produces hydrogen and oxygen gases. This is a reaction. The molecular component of eater has been broken down into two. These two gases have different structures compared to water.

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While standing on a balcony a child drops a penny. The penny lands on the ground floor 1.5 s later. How fast was the penny traveling vertically when it struck the ground floor? *The height of the balcony is 11.025 meters

Answers

Answer:

14.7 m/s.

Explanation:

From the question given above, the following data were obtained:

Time (t) = 1.5 s

Acceleration due to gravity (g) = 9.8 m/s².

Height = 11.025 m

Final velocity (v) = 0 m/s

Initial velocity (u) =?

We, can obtain the initial velocity of the penny as follow:

H = ½(v + u) t

11.025 = ½ (0 + u) × 1.5

11.025 = ½ × u × 1.5

11.025 = u × 0.75

Divide both side by 0.75

u = 11.025/0.75

u = 14.7 m/s

Therefore, the penny was travelling at 14.7 m/s before hitting the ground.

Which geochemical cycle involves mantle convection

Answers

the answer is rock cycle

Which of the following is a characteristic of elements A. They are always metals
B. They cannot be divided into simpler substances
C. They break down when reacting with acids
D. They can be altered with and electric current

Answers

Answer:

Explanation:

They are the BASE elements. Cannot make them any simpler.

The change in pitch of a train's horn as it passes while you are standing still can be explained by A. the Doppler effect.
B. ultrasonic vibrations.
C. sympathetic vibration.
D. resonance.

Answers

The change in pitch of a train's horn as it passes while you are standing still can be explained by the Doppler effect. The correct option among all the options given in the question is option "A". When the sound source from the horn of the train comes closer, the sound seems to come closer each time a sound wave gets emitted. So it comes closer to us in a bunched form. The reverse happens when the train has just passed with each emitted sound going further and further away. The frequency of the sound seems to get lower as the train moves further away.

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A police car is traveling at a velocity of 18.0 m/s due north, when a car zooms by at a constant velocity of 42.0 m/s due north. After a reaction time of 0.800 s the policeman begins to pursue the speeder with an acceleration of 5.00 m/s2. Including the reaction time, how long does it take for the police car to catch up with the speeder?

Answers

Answer:

t = 10.4 s

Explanation:

given,

velocity of the police car = 18 m/s

reaction time of policeman = 0.8 s

acceleration of the policeman to catch up the speeder = 5 m/s²

time taken to catch the speeder be t₁

distance traveled by the police and the speeder will be same

$D_p = D_s$

$u t_1 + (1)/(2)at_1^2 = u' t_1$

$18* t_1+ 0.5 * 5* t_1^2= 42* t_1$

$2.5 t_1^2 - 24 t_1 = 0$

$(2.5 t_1 - 24)t_1 = 0$

$t_1 = (24)/(2.5)$

t₁ = 9.6 s

total time taken by the policeman

= reaction time + t₁

= 0.8 + 9.6

t = 10.4 s

Total time taken by the policeman to catch the speeder is 10.4 s

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