PHYSICS MIDDLE SCHOOL

You must exert a force of 4.5 N on a book to slide it across a table. If you do 2.7J of work in the process, how far have you moved the book?

Answers

Answer 1

Answer:

Answer: 0.6m

Explanation:

Given that:

force = 4.5 N

Work done = 2.7J

Distance moved by the book = ?

Since work is done when force is applied on an object over a distance, apply the formula:

work = force x distance

2.7J = 4.5N x distance

Distance = (2.7J / 4.5N)

Distance = 0.6 m

Thus, the book was moved 0.6 metres far

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Please help me! URGENT!

Answers

A physical change is a change in which no new matters are formed.

Let's get started:
1. a rusting bicycle
This is NOT a physical change because a new substance is formed.
3Fe+ 2O2 -> Fe3O4

2. breaking glass
This is a physical change.

3. melting butter
This is a physical change.
You just change the phase of butter from solid to liquid, but still there is no new substance formed.

4. burning leaves
When you burn something organic, CO2 will be formed.
Therefore, this is NOT a physical change.

5. cutting your hair
This is a physical change.

6. frying an egg
When you fry an egg, iron (Fe) in the yolk reacts with hydrogen sulfide (H2S) in the white to form iron sulfide (FeS).
Therefore, this is NOT a physical change.

7. water evaporating
With the same reason as 3, this is a physical change.

8. mixing salt and water
This is a physical change (with the same reason as 3).
NaCl (s)+ H2O -> NaCl (aq)

Hope this helps~

A physical change only includes changes in state, not the bonds.

Answer:-

- breaking glass
- melting butter
- cutting your hair
- water evaporating.
- mixing salt and water

If two automobiles have the same velocity do they have the same acceleration?

Answers

nope not really one could have a faster acceleration than the other.

Which of the following is associated with fusion but not fission? A. Radiation
B. Radioactive waste
C. Sunlight

Answers

Answer:

sunlight

Explanation:

thought it was uranium fuel lol

Answer:

Explanation:

Which of the following is an important property of stars, because it provides some information about the temperature of a star? Group of answer choices The shape of the star The distance to the star The star's color The star's name

Answers

The star'scolor is an important property of stars because it provides some information about the temperature of a star. The correct option is C.

What does color of star indicates?

A star'shue depends on its temperature; cooler stars seem red, while hotter stars appear blue or white.

This is due to the fact that although stars emitlight over the full spectrum, the predominant hue in the light that we perceive is the color that corresponds to the star's temperature.

The other stated characteristics, such as a star's name, distance from the star, and shape, have no direct bearing on a star's temperature.

However, these characteristics can also provide crucialdetails about the star, such as its size, brightness, and location in the sky.

Thus, the correct option is C.

For more details regarding stars, visit:

brainly.com/question/29359578

#SPJ6

Answer:

The stars color

Explanation:

Scientists know how a Star is by their color like blue is hotter than red

6. A golf ball is hit a distance of 300 yards in 10 sec. What is the speed of the golf ballo