Answer:
Explanation:
Since this is a distance v time graph, the slope of the line from 1s to 3s is the velocity. However, it looks like, at t=3, the velocity is 0, so getting the definite velocity is not going to happen. We can estimate it as closely as possible. Since the line is tending from the upper left to the lower right, the slope is negative, so the velocity is also negative. That leaves only C or D as our answers. And the slope is closer to -1 than to -5, so choice D. is the one you want.
Answer:
Part a)
Part b)
Part c)
Part d)
Explanation:
Part a)
As we know that speed of package is same as that of helicopter in horizontal direction
So after time "t" the velocity in x direction will remain constant while in Y direction it will go free fall
So we have
Part b)
Distance from helicopter is same as the distance of free fall
so we will have
Part c)
If helicopter is rising upwards with uniform speed
then final speed of the package after time t is given as
Part d)
distance from helicopter
Explanation:
Methane (CH4) is 30 times stronger than carbon dioxide as an absorber of infrared radiation.
Answer:
Noble gases are the most stable chemical elements because they have completely filled valence shells containing the maximum number of electrons it can hold. Noble gases forms Group 18 in the modern periodic table. The order down the periodic table is as follows:
helium (He)
neon (Ne)
argon (Ar)
krypton (Kr)
xenon (Xe)
radon (Rn)
oganesson (Og)
Comparison:
The atomic mass increases as we move down the column because the number of neutrons and protons increase.
The melting and boiling points of the noble gases increases down the group. The reason is that the size of the atom increases downwards. Noble gases have London Dispersion Forces between them. As the dispersion increases, the London Dispersion Forces have more chances of forming a bond. Stronger bonds down the group means higher melting and Boiling points.
Similarly, the density of noble gases increases down the group as stronger forces are there between atoms.
The ionization energy decreases down the group of Noble gases because the electrons in bigger noble gases are located away from the nucleus and held less tightly by the atom.
Compared to other elements, Noble gases have low Melting and Boiling points.
