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irina1246 [14]
3 years ago
11

Look at the diagram of a solar eclipse.

Physics
1 answer:
lubasha [3.4K]3 years ago
3 0

Answer:

at location 4

Explanation:

it is because the solar eclipse happens when the moon is covering the sun

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(a) A hole of 1 cm in diameter is drilled in a plate of steel at 20°C. What happens to the diameter of the hole as the steel is
Anestetic [448]

When heat is applied to a substance/material or steel in our case, a series of changes will occur, one of which is Expansion.

Hence the hole will expand from 1cm to a diameter that is greater.

Thermal expansion refers to the expansion or contraction of the dimensions of the solid, liquid or gas when their temperature is changed.

<h3>Types of Expansion</h3>
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Learn more about expansion here:

brainly.com/question/1166774

8 0
3 years ago
Calculate the work performed by an ideal Carnot engine as a cold brick warms from 150 K to the temperature of the environment, w
olga nikolaevna [1]

To solve this problem, apply the concepts related to the calculation of the work performed according to the temperature change (in an ideal Carnot cycle), for which you have to:

W = \int\limit_{T_c}^{T_H} C (1-\frac{T_H}{T})

Where,

C = Heat capacity of the Brick

T_C= Cold Temperature

T_H = Hot Temperature

Integrating,

W = C (T_H-T_C)- T_H C ln (\frac{T_H}{T_C})

Our values are given as

T_H= 300K

T_C = 150K

Replacing,

W = (1) (300-150)-300(1)ln(2)

W = 150-300ln2

W = -57.94kJ \approx 58kJ

Therefore the work perfomed by this ideal carnot engine is 58kJ

5 0
4 years ago
An electric current flows through a parallel circuit. Which units tell you about the amount of electrons traveling in the circui
kompoz [17]

'Ampere' is the unit of current.  That's the rate at which
electrons travel in the circuit ... the number of electrons
every second.  If you wanted the actual amount or number
of electrons, you'd need to know the length of time too.

It doesn't matter whether we're talking about a parallel or
series circuit.
8 0
4 years ago
When a radio is playing in the room next door, which sound waves can be heard best?
sattari [20]

Answer:

low sound waves like bass pass through walls better

Explanation:

6 0
4 years ago
The Periodic Table Question 3 of 10 Based on the trend in valence electrons across periods for main-group elements, how many val
katen-ka-za [31]

Answer:

B. 7

Explanation:

Fluorine has 7 valence electrons in its orbitals.

The valence electrons are electrons in the outermost shell of an atom. Every element has a certain amount of valence electrons.

  • Fluorine belongs to the 7 - group on the periodic table.
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  • Other elements in this group are fluorine, chlorine, bromine, iodine and astatine.
5 0
3 years ago
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