PHYSICS MIDDLE SCHOOL

True or false. A convection current is the circular motion of a fluid caused by the rising of heated fluid

Answers

Answer 1
Answer: true that is what a convection current is

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Identify the objects that you would place into each group. A.wodden logs B.wrench C.plastic button D.cotton balls E. pin F. applev

Answers

F. apple

observation

They utilize and make use of the scientific method in order to have clear basis and evidence for their investigations. Research method is always used to answer every scientific inquiry and in gaining evidential data or knowledge. The scientific method has the following process or at least undergoes the process of
1. Observation 
2. Hypothesis 
3. Experimentation 
4. Interpretation of data 
5. Evaluating the data 
6. Passing and recording the data 

These steps are crucial and the empirical data that these scientists obtain are very important to keep that is why research paper, thesis and dissertations exists. 

suppose a vacuum cleaner use 120 j of electrical energy. If 45 j are used to pull air into the vacuum cleaner, how efficient is the vacuum cleaner?

Answers

It depends on how much time 45 j will go, so if you told me that it went through 45 j per minute it will go through for 2 minutes so not efficient unless it went through 45 j per hour then it is efficient. 

Final answer:

The vacuum cleaner's efficiency is calculated as 37.5%. This is determined by the ratio of useful energy output (45J) to total energy input (120J). Real-world devices typically have efficiencies less than 100% due to energy losses.

Explanation:

The vacuum cleaner's efficiency can be calculated using the formula: Efficiency = (Useful energy output / Total energy input) x 100%. In this scenario, the vacuum cleaner used a total of 120 joules of electrical energy, but only 45 joules of that energy were used for the useful task of pulling in air. Therefore, the vacuum cleaner's efficiency would be calculated as: Efficiency = (45 J / 120 J) x 100% = 37.5%.

It's important to understand that real machines do not achieve 100% efficiency because some energy is always lost as heat due to friction and air resistance. As such, the vacuum cleaner's efficiency of 37.5% fits within expected bounds for real-world devices.

Learn more about Efficiency here:

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What is the term that we use to describe two species living together?A. Camouflage
B. Hibernation
C. Migration
D. Symbiosis

Answers

D. Symbiosis.  Camouflage is a creature disguising itself as its surroundings.  Hibernation is a animal sleeping for an extended period of time when food is scarce to conserve energy.  Migration is an animal moving from one place to another when food is scarce in the first area so it can find more food in the new area.  Symbiosis is two animals living together and helping each other live.

What is constant in all electromagnetic waves?

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their speed, which is the speed of light

Water changes shape to fill the shape of its container. what is the best explanation for this ?

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The answer would be that it is a liquid. It does not have a definite shape. That is why is takes the shape of what ever container it fits into. 
Liquids don't have a definite shape so that means it does not take shape of its contaner but, solids do for example when you put water in a bown and freeze it up then it will stay there. Hope i helped :D

What environmental effects are shared by all fossil fuels

Answers

fossil fuel can cause global warming and greenhouse effects on our earth
one main is climate change or global warming as you can call it
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