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3 years ago

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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A 74 kg firefighter slides, from rest, 4.9 m down a vertical pole. (a) If the firefighter holds onto the pole lightly, so that t

In-s [12.5K]

Answer:

Her speed is 9.8 meter per second

Explanation:

Newton's second law states that acceleration (a) is related with force (F) by:

$\sum\overrightarrow{F}=m\overrightarrow{a}$ (1)

Here the only force acting on the firefighter is the weight F=mg so (1) is:

$mg=ma$

Solving for a:

$a=g$

Now with the acceleration we can use the Galileo's kinematic equation:

$Vf^{2}=Vo^{2}+2a\varDelta x$ (2)

With Vf the final velocity, Vo the initial velocity and Δx the displacement, because the firefighter stars from rest Vo=0 so (2) is:

$Vf^{2}=2a\varDelta x$

Solving for Vf

$Vf=\sqrt{2g\varDelta x}=\sqrt{2(9.81)(4.9)}$

$Vf=9.8\frac{m}{s}$

6 0

3 years ago

TRUE OR FALSE

katen-ka-za [31]

Answer:

True

Explanation:

When an object is held higher, it has more potential energy because more energy is stored from its higher position to swing further than it would have, had it been held lower.

7 0

3 years ago

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Planet A takes 1 year to go around its star at an average of 1 A.U. distance. Planet B is 4 A.U. from the star. Calculate how lo

pentagon [3]

Planet Geos in orbit a distance of 1 A.U. (astronomical unit) from the star Astra has an orbital period of 1 "year." If planet Logos is 4 A.U. from Astra, how long does Logos require for a complete orbit?

TB = <span>8</span> years

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3 years ago

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Why might this cloud formation be termed the “Pillars of Creation"?

Oduvanchick [21]

Answer:

I think the answer might be A

Explanation:

because if its called Pillars creation then something important might be being born maybe

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3 years ago

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A toaster oven uses 65,000 joules of energy in 40sec to toast a piece of bread. What is the power of the oven?

storchak [24]

Answer:

Power = 1625 Watts

Explanation:

Given the following data;

Energy = 65,000 J

Time = 40secs

To find the power;

Power can be defined as the energy required to do work per unit time.

Mathematically, it is given by the formula;

$Power = \frac {Energy}{time}$

Substituting into the equation, we have

Power = 65,000/40

Power = 1625 Watts

3 0

3 years ago