PHYSICS MIDDLE SCHOOL

Newton's laws of motion
Newton's laws of motion - 1

Answers

Answer 1
Answer: 1) The purse falls to the ground because of Newton’s first law, an object in motion stays in motion and an object at rest will stay at rest until an unbalanced force changes it. The first law includes inertia, which occurs when the object wants to continue to go forwards even when it’s been stopped. When Jane stops her car, the purse wants to keep going forward, therefore falling to the ground.

2) when you’re standing on the board, the board pushes up on you, while you/gravity is pushing downwards // when you jump down, the opposite force pushes upwards, allowing you to go up (jump)

3) Newton’s second law, A=F/M

5) 19.5 newtons

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1) Why do the different rocks exposed in the Grand Canyon appear in layers for the most part? Where are the oldest layers of rock found? Where are the youngest rocks found?

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This is what i put:

  TheGrand Canyon is made up of sedimentary rock; over time, sediments formed intolayers. The layers on the bottom are the oldest, and the layers on the top arethe youngest and newest. 

Try and paraphrase though

Answer: C

Scientists observe the layers for evidence of similar rock types and fossil formations to determine the age of landforms. If they find the same fossil in two different locations, scientists may conclude that those fossils are most likely from the same time period. The same is true for landforms made of certain types of rock. When scientists see layers of similar rock sediments, they use that as evidence to support that are from a similar time period. By analyzing the rock layers, scientists estimate that Earth is 4.6 billion years old.

Explanation:

What are the unit for acceleration

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\longrightarrow The rate of change of velocity per unit time is called acceleration.

\longrightarrow Its SI unit is m/s².

\longrightarrow Formula of acceleration is v-u/t

\huge\boxed{\fcolorbox{blue}{red}{Thank you}}

Identify each of the cell structures in the figure

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Fair enough ! Where's the figure ?

Heat Energy can be transferred from a source to a receiver by

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Heat energy can be transferred from a source to a receiver by conduction, convection and radiation.

A candy bar supplies your muscles with energy. If your muscles are 40% efficient, how much work can they perform if the candy contains 800 J?

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Answer:

The muscles can perform 320 J of work.

Explanation:

Let the work performed by the muscles be W_(out) J.

Efficiency of a body is given as the ratio of useful work to that of work supplied.

Here, the work provided by the candy bar is, W_(in)=800\ J

Efficiency of the muscles is, \eta =40\%=0.40

Now, we know that,

\textrm{Efficiency,}\ \eta=(W_(out))/(W_(in))\n0.40=(W_(out))/(800)\nW_(out)=0.40* 800=320\ J

Therefore, the work performed by the muscles is 320 J.

Microwave,radio signal,light,earthquake which does not belong

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Answer:

earthquake does not belong to electromagnetic waves
Earthquake, because the rest are referring to electrical appliances.
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