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Grade 8 Science Winter Interim
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Twoiron balls are dropped from a height of 100 meters One Dal Frame A) is not moving when it is dropped and the second ball is moving horizontally at a constant velocity of 10 m/s when it is dropped (Frame B). The balls follow the
trajectories indicated by the arrows and fall for 4,52 s before hitting the ground. (Ignore air resistance)
Frame A
Frame B
1kg
-10%
10kg

Answers

Answer 1
Ahhhhhhhhhhhh Ask some one else

Related Questions

Fe2O3 (s) + 2 Al (s) ---> 3 Fe (l) + Al2O3 (s) Based on the thermite reaction, how much aluminum oxide (Al2O3) is formed from 8.0 grams of aluminum (Al)?

Answers

Answer:

15.3 g

Explanation:

Fe₂O₃ (s) + 2Al (s) → 3Fe (l) + Al₂O₃ (s)

First we convert 8.0 grams of aluminum into moles, using its molar mass:

8.0 g Al ÷ 27 g/mol = 0.30 mol Al

Then we convert 0.30 moles of aluminum into moles of aluminum oxide, using the stoichiometric coefficients:

0.30 mol Al * [tex]\frac{1molAl_2O_3}{2molAl}[/tex] = 0.15 mol Al₂O₃

Finally we convert 0.15 moles of Al₂O₃ into grams, using its molar mass:

0.15 mol Al₂O₃ * 102 g/mol = 15.3 g Al₂O₃

Which element would you predict to have the highest first ionization energy? Why?

a) neon or carbon

b) fluorine or francium

c) beryllium or strontium

d) iodine or fluorine

Answers

the answer is c and i don’t know why

Balance the equation:
C6H1206 + 02 → CO2 + H2O​

Answers

Answer:

c6h12o6 + 6o2 = 6co2 + 6h20

Explanation:

c6h12o6 + 6o2 = 6co2 + 6h20

0 = 18 18

h = 12 12

c = 6 6

Which substances are most likely acids? Check all that apply. CH4, HI, NH3, HNO3, NaCI

Answers

Answer is: CH4 and NaCI hope this helps you

In the future the universe will most likely

Answers

Answer:A

Explanation: The universe is always expanding at all times. It dosnt expand that much though, very little

A is the correct answer

Determine the empirical formula of the compound with the percent composition of 26.6% K, 35.3% Cr and 33.0% O. *
3 points

Answers

Answer:

KCrO₃

Explanation:

26.6% K, 35.3% Cr and 33.0% O

The steps in obtaining the empirical formulae from percentage composition is given as;

Step 1:

Divide the percentage composition by the atomic mass of the elements

K = 26.6 / 39.0983  = 0.6803

Cr = 35.3 / 51.9961 = 0.6789

O = 33.0 / 16  = 2.0625

Step 2:

Divide all though by the smallest number (0.6789)

K = 0.6803 / 0.6789 = 1.002

Cr = 0.6789 / 0.6789 = 1

O = 2.0625 / 0.6789 = 3.038

The Empirical formular is the ratio between the elements. This given as;

KCrO₃

The energy transformation in an electromagnetic is from chemical to electrical to electromagnetic waves.

True or False?

Answers

True I think but I could be wrong
I think false sounds best but try true first

Calculate the number of moles of NaOH contained in 250. mL of a 0.05M solution.

Answers

Answer:

0.0125mol

Explanation:

Molarity (M) = number of moles (n) ÷ volume (V)

n = Molarity × Volume

According to this question, a 0.05M solution contains 250 mL of NaOH. The volume in litres is as follows:

1000mL = 1L

250mL = 250/1000

= 0.250L

n = 0.05 × 0.250

n = 0.0125

The number of moles of NaOH is 0.0125mol.

.
7)
A 1-gram sample of which substance in a sealed 1-liter container will occupy the container
completely and uniformly?
A)
H2O(g)
B)
H2000)
C
Hg(0)
D)
Ag(s)

Answers

Answer:A) H20 gas

Explanation:

Based on the property of gases, 1-gram sample of hydrogen gas, H₂ in a sealed 1-liter container will occupy the container completely and uniformly.

What is the nature of a gas?

Gases are one of the states of matter.

Gas molecules have negligible forces of attraction between them, therefore, they are always in motion.

Gases do not have a specific shape or volume, rather they fill up every available space in their container.

Of the given option, only H₂ is a gas.

Therefore,  1-gram sample of hydrogen gas, H₂ in a sealed 1-liter container will occupy the container completely and uniformly.

Learn more about gases at: https://brainly.com/question/25736513

Calculate the number of moles of NaOH contained in 250. mL of a 0.05M solution?

Answers

Answer:

0.0125 moles of NaOH are present

Explanation:

Molarity, M, is an unit of concentration widely used in chemistry. Is defined as the ratio between moles of solute (In this case, NaOH) and liters of solution.

250.0mL are = 0.250L of solution. As the molarity of the solution is 0.05M = 0.05moles / 1L, the moles present are:

0.250L * (0.05moles / 1L) =

0.0125 moles of NaOH are present


Which statement does NOT describe a relationship shown in the food web?
A Elk are prey for mountain lions.
B Mice are herbivores that consume grasses and are preyed on by snakes.
COwls prey on rabbits and frogs.
Rabbits consume shrubs and are parasites of grasses.
D
PLEASE HELP

Answers

The answer is D
I know this because rabbits aren’t parasites

PLEASE HELP.!
While studying meiosis and mitosis for her genetics test, Marisa made notes of the kinds of cells produced from these processes with examples from the body. Which pairing of the cell produced during meiosis and example is correct?

A) diploid cell: liver cell

B) diploid cell: sperm cell

C) haploid cell: egg cell

D) haploid cell: hair cell

Answers

Answer:

C

Explanation:

The pairing of the cell produced during meiosis and correct example is haploid cell: egg cell (Option C).

A haploid (n) cell contains only a set of homologous chromosomes, whereas a diploid (2n) cell contains two sets of homologous chromosomes.

Meiosis is a type of reductional cell division by which a parental diploid (2n) cell generates four haploid germinal (egg) daughter cells having half of the genetic material.

Conversely, mitosis is a type of cell division that produces two genetically identical daughter cells.

Meiosis produces germinal (sex) cells, whereas mitosis produces somatic (body) cells.

In conclusion, the pairing of the cell produced during meiosis and correct example is haploid cell: egg cell (Option C).

Learn more in:

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In the reaction below identify the products. CH4 + 202 --> CO2 + 2H2O ​

Answers

Answer:

CO2 and H20

Explanation:

The products are on the right hand side of the equation.

Help pwease!!!!!!!!!!!!!!!

Answers

Answer:

B

Explanation:

I think its water desposits clay in thick , flat layers because the way how a clay feels.

How many atoms of oxygen in the chemical formula 2Ca(ClO2)2?

2
4
6
8

Answers

the answer is 8 atoms

Answer:

D.

Explanation:

what is in veins and artery

Answers

Answer:

the veins and arteries are the things that distribute blood throughout your body. There was a lot more blood in the arteries, that's making them very important and should not be cut ever. Veins on the other hand can be cut but you should still not cut them to begin with as if to not lose any blood. They distribute blood throughout your body that comes from your heart and helps muscles skeletal another systems of your body work.

Blood? I’m not 100% though

example of gases collected through upward delivery​

Answers

Answer:

In this process The more dense gases are collected in a gas jar. Carbon dioxide, Nitrogen dioxide are collected by this way. Air is displaced upward thus, this process is known as upward delivery

Hope it helped :)

Which stateinent is accurate?​

Answers

You might want to elaborate on this

Air that is less dense ______, while air that is more dense ______.

Answers

Air that is less dense Speeds up, while air that is more dense Slows Down.

(please mark brainiest I need for new rank)

4 Hydrogen has three naturally occurring isotopes. H.1, H-2, and H-3 The atomie mass of Hydrogen is 1.097 Which isotope is most abundant in nature? Explain​

Answers

Answer:

The number following the name of the element is the number of subatomic particles inside the nucleus of the atom. This means that it is the mass number of the isotope. The average atomic mass of the element is the sum of the products of the percentage abundance and mass number of the naturally occurring isotopes.

Since, the average atomic mass of the hydrogen is nearest to 1 then, the most abundant isotope should be hydrogen-1.

How many moles of gas are contained in a 50.0 L cylinder at a pressure of 100.0 atm and a temperature of 35.0°C?

Answers

Answer:

n = 2 moles (1 sig-fig)

Explanation:

Using the Ideal Gas Law equation (PV = nRT), solve for n (= moles) and substitute data for ...

pressure = P(atm) = 100atm

volume =V(liters) = 50L

gas constant = R = 0.08206L·atm/mol·K

temperature = T(Kelvin) = °C + 273 = (35 + 273)K = 308K

PV = nRT => n = PV/RT = (100atm)(50L)/(0.08206L·atm/mol·K)(308K)

∴ n(moles) = 1.978moles ≅ 2 moles gas (1 sig-fig) per volume data (= 50L) that has only 1 sig-fig. (Rule => for multiplication & division computations round final answer to the measured data having the least number of sig-figs).

Moles are the ratio of the mass and the molar mass of the substance. In a 50.0 L cylinder, 2 moles of gas are present at 100 atm and 35 degrees celsius.

What is an ideal gas equation?

An ideal gas equation states the relationship between the moles of the substance, temperature, pressure, and volume. The ideal gas equation is given as,

[tex]\rm PV = nRT[/tex]

Given,

The pressure of the gas (P) = 100.0 atm

Volume of the gas (V) = 50.0 L

Temperature (T) = 308 K

Gas constant (R) =  0.08206 L atm/mol K

Substituting values in equation moles (n) is calculated as:

[tex]\begin{aligned} \rm n&= \rm \dfrac{PV}{RT}\\\\&= \dfrac{100 \times 50}{0.08206 \times 308}\\\\&= 1.978\end{aligned}[/tex]

Therefore, 1.978 or 2 moles of gas are present.

Learn more about moles here:

https://brainly.com/question/20343774

Which system controls organs in times of stress?

Answers

Answer:

The autonomic nervous system has a direct role in physical response to stress and is divided into the sympathetic nervous system (SNS), and the parasympathetic nervous system (PNS). When the body is stressed, the SNS contributes to what is known as the “fight or flight” response.

Explanation:

What is the primary difference between a molecule and a compound?
A. All molecules are compounds, but not all compounds are molecules

B. Molecules always contain only one type of atom, unlike compounds

C. Compounds must be composed of more than one type of atom​

Answers

Answer:

A. "All molecules are compounds, but not all compounds are molecules"

Explanation:

An example of a compound-molecule is oxygen. The elemenal is O, because the periodic table isn't describing molecules, it's describing atoms. The molecule is O2 because it takes 2 O atoms to make a molecule of oxygen.

The primary difference between a molecule and a compound is 'compounds must be composed of more than one type of atom​'.

Explanation:

A molecule is a group of atoms of the same or different types of atoms bound to each other.Molecules are the smallest unit of a substance that possesses the characteristic of the substance.A compound is a substance in which two or more different types of atoms are bound to each other.In compounds, atoms of different elements are in a fixed proportion.

So, from this, we can conclude that the primary difference between a molecule and a compound is 'compounds must be composed of more than one type of atom​'.

Learn more about molecules and compounds here:

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What volume of a 0.100 M AgNO3 solution is required to completely react with the CaCl2 in 3.00 L of a 0.100 M CaCl2 solution? The balanced chemical equation is: 2 JUpper A g upper N upper 0 subscript 3 plus upper C a upper C l subscript 2 right arrow 2 upper A g upper C l plus upper C a (upper N upper O subscript 3) subscript 2. L AgNO3

Answers

Answer:

6.00 LAgNO3

Explanation:

Got it right on Edge. :)

Answer:

B

Explanation:

which of the following solids would not decompose on heating​

Answers

Answer:

Anhydrous sodium carbonate is stable to heat and does not decompose even when it is heated to redness. This is because sodium carbonate salt on heating with acids react to release carbon dioxide.

Question: why do astronauts wear organge suits vs white suits

Full answer please..

Answers

Astronauts are found wearing orange-colored Advanced Crew Escape Suit (ACES) while the space shuttle is ascending or entering into space. This peculiar shade of orange known as “International Orange” was chosen for safety as it is highly visible against any kind of landscape, especially in the sea.

What is the mass in grams of 0.94 moles of sodium bicarbonate. NaHCO3?​

Answers

Mass of a substance = Moles of a substance × molar mass of a substance

We have 0.94 moles of NaHCO3. The molar mass of NaHCO3 is the sum of the atomic masses of the elements comprising NaHCO3, which is approximately 84.007 g/mol.

The mass of 0.94 moles of sodium bicarbonate is therefore (0.94 moles NaHCO3)(84.007 g NaHCO3/mol NaHCO3) = 78.97 ≈ 79 grams of sodium bicarbonate.

The effective nuclear charge of a neutral atom aluminum, Al with atomic number 13 is​

Answers

Answer:

wala hindi ko yan alam ty

3.3 mol Fe(OH)3 and 6.3 mole H2SO4react according to the equation 2Fe(OH)3 + 3H2SO4 → Fe2(SO4)3 + 6H2O.
If the limiting reactant is Fe(OH)3, determine the amount of excess reactant that remains. Answer in units of mol.

Answers

Answer and Explanation:

2 mol of Fe(OH)3 produces 1 mol of Fe2(SO4)3  then 2.1 mol of Fe(OH)3 will produce (1)/(2) x 2.01 = 1.05 mol of Fe2(SO4)3  amount of H2O = (6)/(2) * 2.01 = 6.03 mol HO2

In what direction does erosion always occur?
a. Downhill
b. Uphill
C. South
d. West

Answers

I'm going to take a guess here and say it is downhill because water runs down the hill eroding the ground which is why landslides can happen. I'm sorry if I'm wrong.
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1. Find the slope and the y-interceptof the graph of the linear equation.y = -7x + 2A) slope: -3; y-intercept: 21B) slope: 2; y-intercept: -7C) slope: -7; y-intercept: 2D) slope: 2; y-intercept: -7 URGENT !!!!!!!!! Please answer correctly !!!!! Will be marking Brianliest !!!!!!!!!!!!!!!! PLS HELPP What is the volume of the larger rectangular prism in the figure?A)26 cm3B)28 cm3C)80 cm3D)108 cm3 How many ways can Rudy choose 5 pizza toppings from a menu of 7 toppings if each topping can only be chosen once? The following were selected from among the transactions completed by Babcock Company during November of the current year. Babcock uses the net method under a perpetual inventory system.Nov. 3 Purchased merchandise on account from Moonlight Co., list price $89,000, trade discount 30%, terms FOB destination, 2/10, n/30.4 Sold merchandise for cash, $38,210. The cost of the goods sold was $20,810.5 Purchased merchandise on account from Papoose Creek Co., $51,550, terms FOB shipping point, 2/10, n/30, with prepaid freight of $730 added to the invoice.6 Returned $14,000 ($20,000 list price less trade discount of 30%) of merchandise purchased on November 3 from Moonlight Co.8 Sold merchandise on account to Quinn Co., $15,010 with terms n/15. The cost of the goods sold was $10,190.13 Paid Moonlight Co. on account for purchase of November 3, less return of November 6.14 Sold merchandise on VISA, $231,570. The cost of the goods sold was $142,060.15 Paid Papoose Creek Co. on account for purchase of November 5.23 Received cash on account from sale of November 8 to Quinn Co.24 Sold merchandise on account to Rabel Co., $54,800, terms 1/10, n/30. The cost of the goods sold was $33,850.28 Paid VISA service fee of $3,580.30 Paid Quinn Co. a cash refund of $6,420 for returned merchandise from sale of November 8. The cost of the returned merchandise was $3,140.Journalize the transactions. Refer to the Chart of Accounts for exact wording of account titles.CHART OF ACCOUNTSBabcock CompanyGeneral LedgerASSETS110 Cash121 Accounts Receivable-Quinn Co.122 Accounts Receivable-Rabel Co.125 Notes Receivable130 Inventory131 Estimated Returns Inventory140 Office Supplies141 Store Supplies142 Prepaid Insurance180 Land192 Store Equipment193 Accumulated Depreciation-Store Equipment194 Office Equipment195 Accumulated Depreciation-Office EquipmentLIABILITIES211 Accounts Payable-Moonlight Co.212 Accounts Payable-Papoose Creek Co.216 Salaries Payable218 Sales Tax Payable219 Customer Refunds Payable221 Notes PayableEQUITY310 Common Stock311 Retained Earnings312 DividendsREVENUE410 Sales610 Interest RevenueEXPENSES510 Cost of Goods Sold521 Delivery Expense522 Advertising Expense524 Depreciation Expense-Store Equipment525 Depreciation Expense-Office Equipment526 Salaries Expense531 Rent Expense533 Insurance Expense534 Store Supplies Expense535 Office Supplies Expense536 Credit Card Expense539 Miscellaneous Expense710 Interest Expense recall one detail from the passage above that you found interesing about martha washington what did anita lie about in west side story Drag and drop the correct word into the correct location It is important to organize the events in a narrative _________ , or in a way that makes sense to the reader . A correctlyB logically C alphabetically D irrationally What does it mean to be in the red?a.You have more credits than debits.b.You have more debits than credits.c.You cannot find your financial records.d.Your financial records are inaccurate. What does irony add to the story "Lamb to the Slaughter?" i will give brainliest What was one result of labor saving devices such as washing machines and vacuum cleaners The length of a shadow of a building is 29 m. The distance from the top of the building to the tip of the shadow is 36 m. Find the height of the building. Ifnecessary, round your answer to the nearest tenth. The following units of an inventory item were available for sale during the year: Beginning inventory 10 units at $55 First purchase 25 units at $60 Second purchase 30 units at $65 Third purchase 15 units at $70 The firm uses the periodic inventory system. During the year, 60 units of the item were sold. The value of ending inventory rounded to the nearest dollar using the weighted average cost method is In which country would the citizens most likely have a very limited or no right at all to free speech? *A.MexicoB.BrazilC.CubaD.The United States of America help please! will give brainliest Name the four layers of the atmosphere (in order starting at the bottom some one help me with this the highlighted one is the problem builder is buying property where she can build new houses. The line plot shows the sizes of the lots for each house. What is the average size of the lots? 1.1.2Calculate the amount of VAT payable on a coffee mug that costs R75.90(VAT exclusive) 4. The_______were ready to compete. A. band's B. bands' C. bands