An image of a cue ball striking the surface of a pool table is shown. All of the following describe the acceleration of the cue ball EXCEPT-

A. the ball changed direction when it hit the side of the table.

B. the ball traveled at 30 cm/s while it was moving.

C. the ball was at rest until it was struck by the pool cue.

D. the ball eventually came to a stop due to friction.

The acceleration of the cue ball is not described by the ball traveling at 30 cm/s while it was moving. Therefore, option (B) is correct.

Acceleration can be described as the change of velocity of an object with respect to time. The acceleration is a vector quantity as it possesses both magnitude and direction. Acceleration is calculated as the second derivative of position w.r.t. time as well as the first derivative of velocity of an object w.r.t. time.

The force is the product of the mass and acceleration of an object according to Newton's second law of motion,

F = ma

And,    a = F/m

Therefore, the acceleration of a moving object is inversely proportional to its mass.

As the cue ball hit the pool table its direction changed so it defines acceleration as acceleration is a vector quantity. The cue ball eventually stops due to friction.

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You decided you want to make spaghetti for supper. You first light the gas stove because you need to cook the meat. When the meat is cooked, you add sauce to it. Then you put a pot of water on the stove to get it boiling. The next step is putting the spaghetti noodles in to boil. Finally, you drain the spaghetti noodles and add the sauce. Which of the following describes the chemical changes happening?

A Cooking the meat and boiling the water are both chemical changes.
B Lighting the stove and cooking the meat are both chemical changes.
C Light the stove with a match and boiling the noodles are both chemical changes.
D Mixing the pasta sauce with the meat and boiling the noodles are both chemical changes.

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What was surprising or interesting to learn about the very small organisms and objects in today’s lesson? *

What other questions do you have about microorganisms? *

Buying fruit and vegetables needs to be done more often as these types of foods can quickly go rotten. What could you do to slow down the chemical change of fruits and vegetables rotting? Give a reason to support your answer.

One of the major ways humans depend on marine plants is for which of the following?

A.) Production of oxygen

B.) Regulation of ocean temperature

C.) Increasing atmospheric carbon dioxide

D.) Maintaining the concentration of salt

Which statements are true?

All landforms have the same combinations of elevation and relief.
Different landforms have different combinations of elevation and relief.
Elevation is the height of a feature above sea level.
Relief is the height of a feature below sea level.
Relief is the difference between the highest and lowest points in an area.

Jamie completes the following steps in an experiment to investigate how temperature affects how fast something will rust in water. He places a nail in a bowl of water in the sun and a nail in a bowl of water in the shade. He also leaves an iron nail out of the water in a dry bag out of the sun. Why would Jamie leave one out of the water and out of the sun?

A Jamie also wants to test if the water affects how fast the iron nail will rust.
B Jamie notices that the size of the nail is different, so he does not want to use it later.
C Jamie doing all these steps to create a control group to compare his results to.
D Jamie puts the nail in a cooler place to see if it will rust as fast as the other items.

Which element would react faster with oxygen because of the properties it possesses?
Berryllium, Potassium, Neon, Barium

Suppose that 273 g of the substances listed displaces 26 mL of water. What is the substance?

Substances:
Zinc=7.13
Silver=10.50
Lead=11.35

2H2+O2→2H2O
There are four atoms of hydrogen (H) before the reaction. How many atoms of hydrogen are present after the reaction?

4

8

5

2

Which statement best describes what happens to protein when a steak is cooked?
A)It denatures and coagulates during cooking.
B)It decreases in size as amino acids are lost.
C)It loses bacteria because they are denatured.
D)It undergoes polymerization to form longer chains.
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1) you are building a model plane that needs small block inside to balance its weight. you find that the block material you are using has half the density you thought it did. you still need the same weight for the blocks in the plane, and they must have the same width and length. how you can keep the weight the same?


2) your teachers set two cups on a bench at the front of the class. one contains water dyed blue and the other clear water. the teacher says one cup is very salty water and the other one is freshwater. how would you figure out which one is salty and which one is fresh.


3) In much of the world, SI units are used everyday life and not just in science. why would it make sense for people in the united states to use SI in everyday life, too? explain using math terms such as calculate and convert.



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The combination
nation of two or more atoms from same or different elements creates a(n)

In this experiment, you will measure mass and volume of various sport balls, both regularly shaped ball and irregularly shaped. What property of an object can you determine using mass and volume? In the space below, write a scientific question that you will answer by doing this experiment.

Correctly sequence the following from smallest to largest in mass: protons, atom, electrons.

Which is the highest peak of North America?

Which of the following is the best way to explain how baking a cake or frying an egg is a chemical change?

A Both are changing size and shape.
B Heat is changing the texture of both substances.
C Heat is being added to both, causing a phase change.
D The end products of both cannot be reversed to their original forms.

Which reaction is more likely to involve a form of combustion (exothermic)? Explain your reasoning.

An atom of tin has an atomic number of 50 and a mass number of 119. How many protons, electrons, and neutrons are found in one neutral atom of tin?
A.50 protons, 69 electrons, 50 neutrons
B.50 protons, 50 electrons, 69 neutrons
C.69 protons, 50 electrons, 69 neutrons
D.69 protons, 69 electrons, 50 neutrons

Which phrase provides the best definition of a landform region?

a large area where the topography contains the three main landforms
the border where two different landforms meet
a large area where the topography is made up of one landform
a large area where the topography is inconsistent and contains multiple landforms

Which lists only metalloids?
arsenic (As), sulfur (S), and polonium

(Po) antimony (Sb), tellurium (Te), and gallium(Ga)

boron (B), germanium (Ge), and tellurium (Te)

polonium (Po), aluminum (Al), and silicon (Si)

I need an answer to how science shape philosophy!

what is the product of a physical or a chemical change?

What types of organisms are most affected by brinicle formation? What are the dangers of brinicles?

Medical diagnosis and what are common uses of radioactive elements in health care?

ok please help
which goes where and why??

Which part of an atom is involved in chemical reactions?
A.nucleus and its particles
B.negatively-charged particles
C.neutrally-charged particles
D.positively-charged particles

I am an element that has no luster, brittle, and is a poor conductor of electricity. What element can I be?

1. List regions experiencing high pressure.

2. Based on the weather shown in Florida, is Florida experiencing high or low
pressure? How would you indicate this on the map above?

3. What kind of front is the South experiencing?

4. Based on this information, what kind of weather do you think the southern part of
the United States is experiencing?

#5. What does this mean about the current weather conditions in Florida?

#6. What does this mean about the current weather conditions in the state of Washington?