PHYSICS HIGH SCHOOL

Water _____. 1 has a pH value of 0
2 dissolves in most substances
3 is made of helium and oxygen
4 becomes less dense when it freezes

Answers

Answer 1
Answer: The answer is statement 4. This is the most unique property of water since most materials becomes more dense when it undergoes transition from liquid to solid. However, this is not the case of water. When water freezes it becomes less dense because the hydrogen bonds causes the molecule to push each other farther apart.
Answer 2
Answer:

Answer:

The answer is D:becomes less dense when it freezes.

Explanation:

D,because water becomes less dense when it freezes.Please rate and thank me and give me points.I am a newbie.(:

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A 1000 watt microwave oven takes 90 seconds to heat a bowl of soup. How many joules of energy does it use?

Answers

Energy in Joules =  Power in Watts * Time in seconds.

Energy = 1000 watt * 90 seconds.

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A train whistle is at a higher pitch (note) as it approaches you and then drops to a lower pitch as it moves away. This effect is called?

Answers

the effect is called The doppler effect
The effect being mentioned is called "The doppler effect".

A rock containing valuable minerals that can be mined is called A. An inorganic compound
B. An igneous rock
C. An ore
D. An organic compound

Answers

A rock containing valuable minerals that can be mined is called an ore. The correct option is C.

What is an ore?

Ore is a deposit of one or more valuable minerals present inside the Earth's crust.

Metals essential to industry and trade, such as copper, gold, and iron, are found in the most valuable ore deposits. Copper ore is mined for a number of industrialapplications.

Ore is natural rock or sediment that contains one or more valuable minerals, usually metals, and can be mined, treated, and sold for a profit.

Mining extracts ore from the Earth, which is then treated or refined, often through smelting, to extract valuable metals or minerals.

Crushing the rock is the first step in extractingore from it. Heap leaching, flotation, or smelting are methods for extracting ore from rock.

Thus, the correct option is C.

For more details regarding an ore, visit:

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As the pressure on a sample of gas increases, the volume of the sample _____. decreases stays the same increases

Answers

Answer : As the pressure on a sample of gas increases, the volume of the sample decreases.

Explanation :

According to the Boyle's, law, the pressure of the gas is inversely proportional to the volume of gas at constant temperature and moles of gas.

P\propto (1)/(V)     (At constant temperature and moles of gas)

From the we conclude that the higher the pressure of gas, lower will be the volume and lower the pressure of gas, higher will be the volume of gas.

Hence, as the pressure on a sample of gas increases, the volume of the sample decreases.
By Boyle's law the volume of the sample decreases, provided temperature is constant.

Energy that is "lost" during a transformation it is given off as what?

Answers

Heat mostly though it can be light as well

You kick a ball with a speed of 18 m/s at an angle of 32 degrees. How far does the hall land?

Answers

You kick a ball with a speed of 18 m/s at an angle of 32 degrees. How far away does the ball land? 
d = V^2/g*sin(32*2) = 18^2/9.8*0.90 = 29.72 m

Answer:

29.7m

Explanatio
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