Answer: The Answer is A
Explanation: The most noticeable feature of the periodic table is that it is arranged as a chart with seven rows and eight columns, although the number of columns increases toward the bottom of the chart. Chemists refer to each row as a period and each column as a group. Each element in a period has the same ground state, and the elements become less metallic as you move from left to right. Elements in the same group have different ground states, but they have the same number of electrons in their outer shells, which gives them similar chemical properties.
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Answer:
The area under a velocity-time graph is the displacement. Velocity can be negative if an object is moving backwards. The displacement can also be negative. An area beneath the x-axis has a negative value.
The melting of polar ice is one effect of the greenhouse effect, or also global warming.
The greenhouse effect, as defined by Merriam-Webster, is "the <span>warming of the surface and lower atmosphere of a planet (as Earth or Venus) that is caused by conversion of solar radiation into heat in a process involving selective transmission of short wave solar radiation by the atmosphere, its absorption by the planet's surface, and reradiation as infrared which is absorbed and partly reradiated back to the surface by atmospheric gases".
In short, "</span>the warming of the surface and lower atmosphere of a planet".
Answer:
a) The magnitude of the speed of the ball at 2s is 19.62 m/s.
b) The ball has traveled 19.62 m after 2 seconds
c) The ball reaches the ground in 4.24 s.
Explanation:
a) The speed of the ball at 2 s after it was dropped is:
Where:
: is the final speed =?
: is the initial speed = 0 (it is dropped)
g: is the gravity = 9.81 m/s²
t: is the time = 2 s
Then, the speed of the ball at 2s is -19.62 m/s. The minus sign is because the speed is in the negative direction (down).
b) The height at which is the ball after 2 seconds is:
Taking y₀ = 0 we have:
The ball has traveled 19.62 m after 2 seconds. The minus sign is because the height is in the negative direction.
c) The time at which the ball reaches the ground is:
Therefore, the ball reaches the ground in 4.24 s.
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Tsunamis can be a few kilometres