4 years ago

Why are the element from period 2 grouped together

1 answer:

4 0

All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons. As you move down the table, every row adds an orbital.

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A hanging nickel wire with diameter 0.12 cm is initially 2.7 m long. when a 117 kg mass is hung from it,

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3 years ago

Which term describes how fast the atoms or molecules inside an object are moving?

IrinaVladis [17]

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4 years ago

Why unit of pascal is called derived unit?

Annette [7]

Answer:

This is because it is derived from newtons and metres as shown in the expression;

Explanation:

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A turbine blade rotates with angular velocity ω(t) = 8.00 rad/s - 0.20 rad/s3 t 2. what is the angular acceleration of the blade

Irina18 [472]

Given: <span>ω(t) = 8.00 - 0.2*t^2

Differentiating both sides with respect to time we get:
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4 0

4 years ago

You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 690.0 kg and was tra

butalik [34]

Answer:

The speed of car A before collision is 3.5 km/h.

Explanation:

Mass of car A = 690 kg eastwards

Mass of car B = 520 kg at 74 km/h west wards

Distance, s = 6 m

coefficient of friction = 0.75

Let the speed after collision is v.

Use third equation of motion

$v^2 = u^2 + 2 as \\\\0 =v^2- 2 \times 0.75\times9.8\times 6\\\\v = 9.4 m/s = 33.84 km/h$

Let the initial speed of car A is v'.

Use conservation of momentum

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690 v' + 38480 = 40898

v' = 3.5 km/h

8 0

3 years ago