A person throws a ball up into the air, and the ball falls back toward Earth. At which point would the kinetic energy be the lowest?(1 point)
A)when the ball is at its highest point

B) at a point when the ball is still rising

C)when the ball leaves the person’s hand

D) at a point before the ball hits the ground

When a person throws a ball up into the air, and the ball falls back toward Earth, the kinetic energy will be the lowest when the ball is at its highest point (option A).

Kinetic energy is given by:

[tex] K = \frac{1}{2}mv^{2} [/tex]

Where:

m: is the mass

v: is the velocity  

So, the kinetic energy is proportional to the velocity and the mass of the object.

When the person throws the ball up into the air, the ball will move upward to a maximum height and then will move down until it hits the ground.

From the statements:

A) When the ball is at its highest point, the velocity will be zero, so the kinetic energy will be zero.  

B) When the ball rises, the velocity decreases, so the kinetic energy will also decrease.    

C) When the ball leaves the person's hand, it has an initial velocity that is the highest, so the kinetic energy has at this point, the maximum value.  

D) Before the ball hits the ground, the ball's velocity has the same value (in magnitude) as the initial value (when the ball leaves the person's hand), so the kinetic energy will be the highest at this point (like statement C).  

Therefore, the kinetic energy will be the lowest when the ball is at its highest point (option A).  

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A student pot acabe of better on a metal rod. Then be placed the other end of the red in a beaker of hot water. The setup for the investigation is shown below
The butter melted in ten minutes. What type of energy did the metal rod conduct to the butter?
electrical
chemical
thermal
mechanical

Why were the iron fillings in a water a suspension?

A green box contains a blue box and a pink box. The blue box contains C H subscript 4 + 2 O subscript 2. An arrow then leads in the green box to the pink box, which says C O subscript 2 + 2 H subscript 2 O. Lines lead from labels to parts of the boxes. Label A leads to the beginning of the green box. Label B leads to the + in the blue box. Label C leads to the arrow. Label D leads to the 2 in 2 H subscript 2 O. Label E leads to the end of the pink box.
Identify each part of this chemical equation that describes the burning of methane and oxygen.

B (blue box):

D (number):

E (purple box):

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.

HELP ME PLEASE I REALLY NEED HELP EXPLAIN IN YOUR OWN WORDS SHOW WORK PLEASE
Be sure to show your work and explain how you got 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 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

Eriq, a chemist, is running tests with four unknown elements. He has found that they all bond the same way, so he knows that they are in the same group on the periodic table of elements. The table shows other properties that Eriq observed.

A 4-column table with 4 rows titled properties of four unknown elements. The first column titled element number has entries 1, 2, 3, 4. The second column titled melting point has entries 266 K, 172 K, 387 K, 53 K. The third column titled boiling point has entries 332 K, 239 K, 457 K, 85 K. The fourth column titled phase at room temperature has entries liquid, gas, solid, gas.

These four elements are most likely in group

15.
16.
17.
18.

A scientist is studying a compound that includes nitrogen, carbon, oxygen, and hydrogen. Is the scientist studying an organic molecule? Why or why not?

What is the main difference between a chemical and a physical change? Use examples to support your answer.

After studying chemical reactions in school, Jen examined some of the different ways people use synthetic materials. She found that there are a variety of ways people use them. What are some of the ways people use these materials and why?
Please help out

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

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

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?

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

A. On the Periodic Table of Elements, columns are called ______________________; all of these
elements
have the same number of ___________________________.
B. On the Periodic Table of Elements, rows are called _____________________; all of these have the same
number of __________________________.

Describe one example of an energy transformation in this diagram and explain why it is a transformation. Repeat this description and explanation for an energy transfer.

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.

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.

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)

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

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

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

Hey can you help thanks

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? *

Gold atoms can be identified based on the number of which subatomic particles?
A.neutrons
B.electrons
C.nuclei
D.protons

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.



HELP ME PLEASEE

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.

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.

what coeiffecents need to be added to balance to balance the chemicial equation Na+02 arrow NaO2

scientific investigation starts with an observation of a natural phenomenon or problem, what observation prompted the family to conduct a scientific investigation? (please need help)