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2 years ago

What element atomic number is in Group 17 and Period 6?

Physics

1 answer:

notsponge [240]2 years ago

7 0

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The halogen elements are the six elements in Group 17 of the periodic table. Group 17 is the second column from the right in the periodic table and contains six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (As), and tennessine (Ts).

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A 35-year-old patent clerk needs glasses of 50-cm focal length to read patent applications that he holds 25 cm from his eyes. Fi

Natali5045456 [20]

Answer:

28.57 cm

Explanation:

We are given that

Focal length, $f=50 cm$

Distance of application from his eyes,s=40 cm

$\frac{1}{s}+\frac{1}{s'}=\frac{1}{f}$

$\frac{1}{40}+\frac{1}{s'}=\frac{1}{50}$

$\frac{1}{s'}=\frac{1}{50}-\frac{1}{40}=\frac{4-5}{200}$

$s'=\frac{200}{-1}=-200 cm$

s=25 cm

Substitute the values

$\frac{1}{25}-\frac{1}{200}=\frac{1}{f'}$

$\frac{8-1}{200}=\frac{1}{f'}$

$\frac{1}{f'}=\frac{7}{200}$

$f'=\frac{200}{7}=28.57 cm$

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2 years ago

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Tema [17]

Answer:

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Explanation:

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2 years ago

A 1200 kg safe is 2.0 m above a heavy-duty spring when the rope holding the safe breaks. The safe hits the spring and compresses

makvit [3.9K]

the spring constant is 200kN/m.

The work done on the spring by the the free falling safe is equal to the kinetic energy of the spring:

W1 = $\frac{1}{2}$ k $x^{2}$

The work done on the safe by gravity is the potential energy of the spring:

W2 = (mass of safe) x g x (height)
= 1000kg x 9.8 m/s^2 x (2 + 0.54)m
=1000kg x 9.8 m/s^2 x (2.54)m
= 24,892 N-m

W2 = W1 =24892 N-m
⇒ $\frac{1}{2}$ k $(0.5)^{2}$ = 24892 N-m

Therefore, k = $\frac{(24892)*2}{0.5*0.5}$ = 199136 kN/m.

The spring constant is 199,136 N/m ≈ 200 kN/m

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Serga [27]

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3 years ago

Which product tells when tropical storm-force winds (greater than 39 mph) can be expected to subside in your area?

Tju [1.3M]

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