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Ganezh [65]
3 years ago
5

Why do elements in the same group or column of the periodic table have similar properties? A. They have the same number of proto

ns. B. They have the same number of neutrons. C. They have the same number of outer shell electrons. D. They have the same number of electron shells.
Physics
1 answer:
Oxana [17]3 years ago
3 0
The Answer is C. The outer shell electrons are the electrons which are involved with chemical reactions and bonding. All elements in the same group have different number of total electrons but ALL have the same number of outer shell electrons. This is why they exhibit similar chemical properties. 
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A concrete piling of 50 kg is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch?
pentagon [3]

Explanation:

It is given that,

Mass of concrete pilling, m = 50 kg

Diameter of wire, d = 1 mm

Radius of wire, r = 0.0005 m

Length of wire, L = 11.2

Young modulus of steel, Y=20\times 10^{10}\ N/m^2

The young modulus of a wire is given by :

Y=\dfrac{\dfrac{F}{A}}{\dfrac{\Delta L}{L}}

Y=\dfrac{F.L}{A\Delta L}

\Delta L=\dfrac{F.L}{A.Y}

\Delta L=\dfrac{50\ kg\times 9.8\ m/s^2\times 11.2\ m}{\pi (0.0005\ m)^2\times 20\times 10^{10}\ N/m^2}

\Delta L=0.034\ m

So, the wire will stretch 0.034 meters. Hence, this is the required solution.

8 0
3 years ago
A roller coaster travels 41.1 m at an angle of 40.0°
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Answer:

41.1 ÷ 40.0

Explanation:

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2 years ago
A raindrop of radius r falls from a certain height h above the ground. The work done by
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Answer:

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Explanation:

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5 0
3 years ago
Carlos is making phosphorous trichloride using the equation below. He adds 15 g of phosphorus.
Degger [83]
Given:

The balanced chemical reaction of the synthesis of phosphorus trichloride:

2P + 3Cl2 ===> 2PCl3

Initial amount of phosphorus = 15 grams

The amount of product produced from 15 grams of phosphorus:

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The amount of chlorine is 44.31 grams, nearest to 45 grams. 
8 0
3 years ago
Read 2 more answers
What do you need to include in a free body diagram?
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Answer:

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Moments are portrayed by curved arrows pointing in the direction in which they impact the body.

A coordinate system is a series of coordinates.

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3 years ago
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