The speed of the yacht : 100 km/h
Further explanationLinear motion consists of 2: constant velocity motion with constant velocity and uniformly accelerated motion with constant acceleration
At constant velocity motion:the speed of vo = v = constant
acceleration = a = 0
Δx = vt or x = xo + vt
An equation of constant velocity motion
[tex]\large {\boxed {\bold {x = v \times \: t}}}[/tex]
x = distance = m
v = speed = m / s
t = time = seconds
A yacht sailed at a steady speed for 0.5 hours, and traveled 50 kilometers
so the velocity/speed:
[tex]\tt v=\dfrac{x}{t}\\\\v=\dfrac{50~km}{0.5~h}=\boxed{\bold{100~km/h}}[/tex]
Help me balance this equation please.
NaCl + H2O —→ Cl2+ NaOH + H2
Answer:
2NaCl + 2H2O --> Cl2 + 2NaOH + H2
Explanation:
Family members on a camping trip decide to make hot cocoa after dinner. They add instant cocoa mix to hot water. What can they do to make the cocoa mix dissolve faster?
A stir the hot cocoa
B halve the amount of water
C double the amount of cocoa mix added
D add the cocoa mix after the water cools
Answer:
Your ANSWER:
A.stir the hot cocoa
Explanation:
stirring helps particals dissolve faster
In the reaction 4AI+_O2 2AI2O3, what coefficient should be placed in front of the O2 to balance the reaction?
Answer: 3
Explanation: I took the k12 quiz
engineers create a new metal that i stronger than steel but much lighter
Answer:
Yes. True
Explanation:
Yes, this is true that engineers can make a lighter, cheaper, stronger material. Currently this metal is used for aircraft, and is easy to manufacture.
Forces can be represented by _____,
called vectors, that show the direction of a force.
Answer:
vector
Explanation:
The research and design team of a car manufacturing company is developing a new safety product that automatically
tests a car's brakes. When the team discusses how exactly they plan to determine whether the new technology is
successful or not, what stage of technological design are they in?
O first
O second
third
O fourth
The team should discuss the plan to determine whether the new technology is successful or not in the fourth stage. The correct option is D.
What are different stages of technology testing?When a company manufactures any item, he test it before sending it to the market. This is called technology testing. The test goes from four stages. Here, the item is car's break.
Thus, the correct option is D, fourth stage.
Learn more about technology testing
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According to the rules covered in this class, which of the following ionic compounds is named incorrectly?
cobalt(II) oxide
nickel(II) sulfide
copper(II) selenide
zinc(II) telluride
All of these names are correct.
Answer: is copper(ll)selenide
Explanation:
is copper (ll)selenide
i hope this help
Which postulate of the kinetic-molecular theory applies to the particles of a liquid?
They do not move freely but vibrate in a stationary position.
They can be compressed, which causes a large change in volume.
They have so much kinetic energy that their intermolecular forces are negligible.
They have enough kinetic energy to easily slide by each other.
The particles of liquid have enough kinetic energy to easily slide by each other. The correct option is D.
What is kinetic-molecular theory?The kinetic-molecular hypothesis stated matter states and is based on the assumption that matter is made up of tiny particulate that are constantly in motion.
This theory adds to the knowledge of observable properties and behaviors of solids, liquids, and gases.
Because they are densely packed and vibrate in place, solids have the lowest kinetic energy.
Since liquids have higher kinetic energy, the particles slide past each other. Because gases have the most kinetic energy, they float around in the air.
Particles in liquids are very close together and move randomly throughout the container.
Due to the shorter distances between particles, particles move rapidly in all orientations but strike with each other more frequently than in gases.
Thus, the correct option is D.
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What is the negatively charged sub-atomic particle of an atom?
A) Proton
B) Neutron
C) Electron
Which of the following has a higher electronegativity oxygen or selenium?
Answer: Oxygen
Explanation: Oxygen has more ionisation energy and Oxygen has a small size which makes it more electronegative.
Heat is most closely related to which kind of energy? O nuclear Oelectrical thermal chemical
Answer:
thermal
Explanation:
Answer:
thermal energy
Explanation:
because thermal energy produces heat
HELP QUICK What is the mass of an object that has a volume of 2 ml and a density of 10g/ml?
Answer:
The answer is 20 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 10 × 2
We have the final answer as
20 gHope this helps you
Please help me with this I’ve been on this question for 10 minutes now...
Answer:
A
Explanation:
we know that pangea was when all the continents were connected and the tectonic plates moved, causing pangea to split into multiple pieces. so north america was formed by moving tectonic plates.
i hope this helps :))
I've asked before and gotten spammed hopefully I won't get spammed this time please help me with this someone. pls help anyonw
Answer:
See below!
Explanation:
A. The picture of the graph is attached. You can tell the amount of protons in an element by looking at the periodic table. The elements are ordered by the number of protons in an element.
B. Carbon and silicon are at the peaks of the chart. The peak is the highest point in a graph.
C. The elements belong to the non-metal group.
D. The halogens are non-metals, and their vapors are colorless.
The halogens are toxic to humans.
Halogen molecules are made of two atoms; they are diatomic.
Halogens react with non-metals to form crystalline compounds that are salts.
The halogens get less reactive going down the group on the periodic table.
Halogens can bleach vegetable dyes and kill bacteria.
E. The picture of the table is attached. To figure which numbers to put where, you need to pay attention to the other numbers. The halogens follow a trend with each of these properties. You have to put in the numbers that fit in among the other numbers.
4
The element bromine at room temperature is a liquid with a density of 3.12 g/nl.
Calculate the mass (wanted measurement) of 125 mL (given measurement) of bromine.
(use the given density as the conversion factor to calculate the wanted measurement).
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How could you measure the average kinetic energy of a group of particles
Answer:
Temperature measures the average kinetic energy of the particles in a substance. Thermal energy measures the total kinetic energy of the particles in a substance. The greater the motion of particles, the higher a substance's temperature and thermal energy.
Explanation:
Which of the following is/are correct about light?
A.
Light always travels at the same speed.
B.
Light cannot travel through liquids.
C.
Light energy travels as waves.
D.
all of these
Answer:
D. Light energy travels as waves.
How many atoms are in a sample of 2.89 moles of potassium (K)?
Answer:
The answer is
1.74 × 10²⁴ potassium atomsExplanation:
To find the number of atoms given the number of moles we use the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
n = 2.89 moles
We have
N = 6.02 × 10²³ × 2.89
We have the final answer as
1.74 × 10²⁴ potassium atomsHope this helps you
Observe: Scandium is the first element to contain electrons in the d subshell. How many orbitals does the d subshell have, and how many electrons can fit in the d subshell?
Answer: 5 orbitals
Explanation:
Each d subshell has 5 orbitals, with 10 electrons. So it's like for every orbital, there are 2 electrons. Look at orbital diagrams (if your teacher made you draw them), and you will see that an arrow pointing both UP AND DOWN represent 2 electrons (arrow upward=1 electron, arrow downward=1 electron)
Here, we are required to determine how many orbitals does the d subshell have, and how many electrons can fit in the d subshell.
The d subshell has 5 orbitals.The number of electrons that can fit in the d subshell is; 10 electronsThe d subshell is first recorded in the shell with energy level 3.
The orbitals in an atom are organized into different layers or electron shells. The d subshell has 5 orbitals in it.
This is evident from the formular; 2l + 1.
where l = 2 for the d subshell.
As with any sub-orbital, the sub-orbitals in the d-subshell also contain 2 electrons each.
According to Pauli's exclusion principle, the two electrons in each must have opposing spin.
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please help asap !! i don’t know if that’s the right answer
Answer:
b, c and d (last three options)
Explanation:
It can't be the first one because:
On the left hand side there is one of everything and then on the right, ther is one zinc, two chloride and 2 hydrogen atoms. It is unbalanced
Second one:
there are 8 carbons on both sides, 20 hydrogens on both sides and 26 oxygen on both sides. It is balanced
Third
1 copper on both sides, 2 hydrogens on both sides and 1 oxygen on both sides. It is balanced
Fourth
4 silver on both sides and 2 oxygens on both sides
Which type of reaction has the general formula of AB + CD→ AD + CB
Answer:
Double replacement reactions
Explanation:
CD are two reactant compounds, while AB and CB are two product compounds that results from the reaction, in this type of reaction B and D change places
Gravitational potential energy depends on the strength of gravity, ________ and ________ of the object.
options:
height and mass
friction and movement
mass and movement
height and friction
The answer is A Height and Mass
Gravitational potential energy depends on the strength of gravity; A. height and mass of the object.
Gravitational potential energy (G.P.E) can be defined as the energy possessed by a physical object or body due to its position (height) above planet Earth.
Hence, gravitational potential energy (G.P.E) is highly dependent on mass, height of an object or body and the acceleration due to gravity.
Mathematically, gravitational potential energy (G.P.E) is given by the formula;
[tex]GPE = mgh[/tex]
Where:
G.P.E is the gravitational potential energy. m is the mass of an object. g is the acceleration due to gravity. h is the height of an object.In conclusion, the three (3) main factors that gravitational potential energy (G.P.E) depends on are:
I. Strength of gravity.
II. Height.
III. Mass.
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how many valence electrons does tungsten have
Answer:74
Explanation:
Answer:
I believe Tungsten has 2 valence electrons.
Explanation:
Hope this helps!
What are diatomic molecules and are they compounds? PLEASE ANSWER ASAP!!
Answer:
Diatomic molecules consist of two atoms that are chemically bonded. The two atoms can be the same or different chemical elements. As for whether or not they are compounds, there is not technically an answer. This is because all compounds are molecules, but not all molecules are compounds. For example diatomic molecules that comprise the chemical compounds nitric acid, carbon monoxide, and hydrogen chloride are made up of two different elements. As you can see, most diatomic molecules are not made up of the same kind of elements and not every diatomic molecule comprises a chemical compound.
hope this helps :)
Explanation:
meaning of carbon cycle
The carbon cycle is nature's way of reusing carbon atoms, which travel from the atmosphere into organisms in the Earth and then back into the atmosphere over and over again. Most carbon is stored in rocks and sediments, while the rest is stored in the ocean, atmosphere, and living organisms
4 steps of Carbon Cycle
Photosynthesis, Decomposition, Respiration and Combustion.
Matter is anything that takes up space and can be described by physical and chemical properties. Which statement
BEST differentiates chemical properties from physical properties?
A)
Physical properties are properties that can be physically seen or touched,
while chemical properties can only be found when matter is mixed with
specific chemicals.
B)
Physical properties are measured when matter changes its physical state,
while chemical properties can only be measured if matter remains in one
state for an extended time.
C)
Physical properties are difficult to measure because they require special
tools to detect, and chemical properties are easy to measure and require
not special tools to detect.
D)
Physical properties can be measured/observed without changing matter
into something else, while chemical properties describe matter's ability to
react/combine with other matter.
Answer:
D)
Physical properties can be measured/observed without changing matter
into something else, while chemical properties describe matter's ability to
react/combine with other matter.
Explanation:
Physical Change
The changes that occur only due to change in shape or physical properties but their chemical or internal composition remain unchanged.
1 = These changes were reversible.
2= They have same chemical property.
3= These changes can be observed with naked eye.
Example :
Water converting to Ice
Water converting to gas
In this water molecule remain the same only they rearrange themselves that change its state of mater not composition
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
1 = These changes are irreversible
2 = These changes occur due to chemical reactions
3 = These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO₂ and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg .
The reaction of Hydrogen and oxygen:
H₂ (g) + O₂ (g) → 2H₂O (l)
Are hemoglobin formation and functioning brains and muscles benefits of Iron?
What is the length of one mole of the typical cell phone that is approximately 15 cm in length?
i dont know how to remove my answer so ignore this
Answer:
Some objects of more than 15 cm and less than 30 cm can be:
A rule.
A cell phone.
A pencil.
A calculator.
A laptop charger.
We have to measure it helps us to compare and to obtain physical magnitudes of different objects.
Measurement is the action of obtaining a representative magnitude of a particular object, now, to measure we need to compare and have reference points.
See more at brainly.lat/tarea/3935004.
Explanation:'
I hope my answer is to your liking; 3 gi v me a crown, please
What pair of elements have the same number of valence electrons?
a) Li and Na
b) Mg and K
c) Ti and Nb
d) Rb and Zr
The ans is A.
You need to refer back to the periodic table n find the 2 the is under the same grp.
Answer: its A
Explanation:
PLSSS HELP WILL GIVE A LOOT OF POINTS
The diagram below shows two metal plates at different temperatures. Plate X is 30 degrees Celsius ( oC) and Plate Y is 50 degrees Celsius ( oC).
A.Plate X will become cooler and Plate Y will become cooler.
B.Plate X will become warmer and Plate Y will become cooler.
C.Plate X will become cooler and Plate Y will become warmer.
D.Plate X will become warmer and Plate Y will become warmer.
Answer:
I think B but I'm not sure.
Answer:
C.
Explanation:
