PHYSICS MIDDLE SCHOOL

Which two of the following are the densest of the materials shown? Material Mass (g) Volume (L)

Rock 1000 0.5

Pillow 200 10

Bottle of soda 2000 2

Loaf of bread 100 1


rock and bottle of soda

loaf of bread and rock

loaf of bread and pillow

bottle of soda and loaf of bread

Answers

Answer 1
Answer:

Explanation:

The density of the material is given by,

Density = (mass)/(Volume)

Case 1: Rock

Density = (mass)/(Volume)

Density = (1000)/(0.5)

Density = 2000 (g)/(L)

Case 2: Pillow

Density = (mass)/(Volume)

Density = (200)/(10)

Density = 20 (g)/(L)

Case 3: Bottle of Soda

Density = (mass)/(Volume)

Density = (2000)/(2)

Density = 1000 (g)/(L)

Case 4: Load of bread

Density = (mass)/(Volume)

Density = (100)/(1)

Density = 100 (g)/(L)

Thus, rock and bottle of soda has maximum density.

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Gravity has traditionally been defined as a force of attraction between things that have

Answers

The gravity has traditionally been defined as a force of attraction between things that have masses.

Explanation:

Gravitational force is a type of attractive force. It is because of this force, that we are able to walk on this Earth. Also due to gravitational force, the solar system and the galaxies are existing in the universe. Sir Issac Newton first discovered this force. He postulated the universal law of gravity. And according to this law, the gravitational force will be acting between the objects having masses and separated by a distance. So in this law, it states that gravitational law is directly proportional to the product of masses and inversely proportional to the square of the distance between them.

Thus, the gravity has traditionally been defined as a force of attraction between things that have masses.

Which body system make movement possible

Answers

The intestinal system, which is part of the alimentary system.
Muscular system makes movement possible

Why don't the present shapes of the continents fit perfectly into the supercontinent?

Answers

The reason why the shapes of the continents as of today do not perfectly fi into to super continent because long time ago the super continent was scattered into pieces. And as times go by, those smaller parts of super continents undergo soil erosion caused by the water and other way that causes their original shapes change.  
Thus, if we are going to judge now if those smaller part of super continent, they’re no longer gonna fit perfectly because through time their original form changed

I need physics help!!

Answers

Answer: magnitude = 5 and angle = 160°

Explanation:

A vector has magnitude 5 and angle -20°

A vector can be written in terms of its components as :

\vec{A}=A_x\hat{i}+A_y\hat j \n \Rightarrow \vec A = A cos\theta \hat i+A sin\theta \hat j

using trigonometry identity:

sin θ = -sin ( 180 + θ )

cos θ = - cos (180 + θ)

Thus, we can write the same vector as:

\vec A = -A cos(180+\theta) \hat i+(-A) sin(180+\theta) \hat j

Magnitude |A|=√((-A)^2+(-A)^2) = A = 5

Thus, the magnitude would be A = 5 and angle = 180+θ= 180-20 = 160°

Use free fall in a sentance

Answers

Free fall means rapid fall or a downward motion due to gravity. Sentence example: When Joe was accidentally bumped by Sarah, he was sent towards a free fall down the escalator, leading to a serious injury on his arm and two legs.
the jumpers were required to free fall for 8 second

An optical fiber can make a light beam travel in a path that is curved or twisted? True or False

Answers

Answer:

True

Explanation:

An optical fiber is like a glass tube with very small radius. The light travels through these fiber following Total Internal Reflection principle. The movement of the light is not affected by the external factor or the shape of the fiber as long as it is intact. Even if it is twisted or curved, the light will travel as long as the fiber is not damaged physically.
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