Which of the following cannot be determined by analyzing the periodic table?

Physics

2 answers:

Damm [24]3 years ago

6 0

Answer: Option (c) is the correct answer.

Explanation:

Periodic table is basically a chart which depicts symbol of all the elements found in nature. And, these elements are represented along with their atomic number, and mass number.

Also, elements present in their respective period will tend to have same number of shells.

For example, potassium and scandium are both period 4 elements and they have four energy shells.

Thus, we can conclude that the year the element was discovered cannot be determined by analyzing the periodic table.

dybincka [34]3 years ago

4 0

Your answer is C) The year the element was discovered :)

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You want to close an open door by throwing either a 400-g lump of clay or a 400-g rubber ball toward it. you can throw either ob

gogolik [260]

Refer to the diagram shown below.

Let m = the mass (g) of the door.
Let v = the launch velocity
Let u = the velocity of the door after impact.

Elastic impact (rubber ball):
The rubber ball bounces off the door with presumably elastic impact, which means that both momentum and kinetic energy are conserved.
Conservation of momentum requires that
400v = -400v + mu
Therefore
$u=( \frac{800}{m} )v$

Inelastic impact (clay):
The clay sticks to the door after impact.
Conservation of momentum requires that
400g = (m+400)u
Therefore
$u=( \frac{400}{m+400} )v$

When we compare magnitudes of u for the door, we find that
$u_{1}=( \frac{400}{m} )(2v), \,\, elastic \\\\ u_{2}=( \frac{400}{m+400} )v , \,\, inelastic$
Clearly, the elastic impact creates a greater value of u for the door.

Answer:
The rubber ball creates a larger impulse to the door because the nature of its impact is approximately elastic.