I need help with 4, 5, 8, 9, and 6. Quickly I need it before class starts. Worth points!!!!!! HelP
Answers
Answer:
4. 264.6J
5. 37.5J
6. 96J
7. 55Watts
8. 77.14m
9. 6s
10. 750Watts
Explanation:
4). Mechanical energy (potential energy) = mass (m) × acceleration due to gravity (g) × height (h)
m = 3kg, h = 9m, g = 9.8m/s²
P.E = 3 × 9 × 9.8
= 264.6J
5). Kinetic energy (K.E) = 1/2 × m × v²
Where;
m = mass (kg) = 3kg
v = velocity (m/s) = 5m/s
K.E = 1/2 × 3 × 5²
K.E = 1/2 × 3 × 25
K.E = 1/2 × 75
K.E = 37.5J
6). Work done (J) = Force (N) × distance (m)
Force = 12N, distance = 8m
Work done = 12 × 8
= 96J
7). Power = work done (J) ÷ time (s)
Work done = 550J, time = 10s
Power = 550/10
= 55Watts.
8). Work done = force (F) × distance (m)
Work done = 540J, force = 7N, distance = ?
540 = 7 × d
540 = 7d
d = 540/7
d = 77.14m
9). Power = work done (J) ÷ time (s)
Work done = 300J, time = ?, Power = 50Watts.
50 = 300/t
50t = 300
t = 300/50
t = 6seconds.
10). Power = work done (J) ÷ time (s)
This means that;
Power = force × distance / time
Force = 300N, distance = 5m, time = 2s
Power = 300 × 5 ÷ 2
Power = 1500 ÷ 2
Power = 750Watts
Related Questions
Which of the following best explains what happens when the kinetic energy of particles in a liquid state increases?
Answers
Answer:
They move slowly enough that the particles are no longer held together, resulting in a gas. They move slower, increasing the forces of attraction that hold them together and forming a solid.
Please please please someone give me the answers to all of these our teacher is very bad at explaining things and we are all confused i really need the answers please
Answers
Answer: #1 2Al + 2S - Al2S2
Explanation: You have to make sure there are 2 of each on each side
q=The+diagram+below+represents+the+building+block+of+a+DNA+molecule+which+is+a+type&rlz=1CATPIA_enUS942&sxsrf=ALeKk02q0TrtMmY64OTcRfnI6UtHtyfVwg:1614616724451&source=lnms&tbm=isch&sa=X&ved=2ahUKEwi2l7yCxI_vAhVjg-AKHXaSCVcQ_AUoAXoECBIQAw&biw=1517&bih=726#imgrc=YTAoiVTgM8UvnM
Answers
Answer:
we need to see the diagram
Explanation:
Why does lithium have a higher ionization energy compared to sodium?
Answers
Answer:
There are 11 protons in a sodium atom but only 3 in a lithium atom, so the nuclear charge is much greater. ... The only factor left is the extra distance between the outer electron and the nucleus in sodium's case. That lowers the ionization energy.
What is this molecule an
example of?
A. an atom
B. a mixture
C. an element
D. a compound
PLEASE HELP ASAP
Answers
Answer:
D. Compounds
Explanation:
Because it's says that have 3 components
What is the pattern in the periodic table for valence electrons and orbital shells of an element?
Answers
Answer:
Valence electrons increase as you go across the table (by periods)
Orbital Shells increase as you go down the table (rows)
How many moles are in 4.0 x 1023 atoms of iron?
Answers
Answer:
4092 atoms of iron i am guessing
Explanation:
How many moles are in 4.1 x10 22 molecules of NaCl?
Answers
Answer:
[tex]\boxed {\boxed {\sf 0.068 \ mol \ NaCl}}[/tex]
Explanation:
To convert from molecules to moles, Avogadro's Number must be used. This number is 6.022 *10²³. It tells us the number of particles (atoms, molecules, etc.) in 1 mole of a substance.
In this case, the particles are molecules of sodium chloride. We can make a ratio.
[tex]\frac {6.022*10^{23} \ molecules \ NaCl}{ 1 \ mol \ NaCl}[/tex]
Multiply by the given number of molecules.
[tex]4.1*10^{22} \ molecules \ NaCl *\frac {6.022*10^{23} \ molecules \ NaCl}{ 1 \ mol \ NaCl}[/tex]
Flip the fraction so the moles of sodium chloride cancel.
[tex]4.1*10^{22} \ molecules \ NaCl *\frac {1 \ mol \ NaCl}{6.022*10^{23} \ molecules \ NaCl }[/tex]
[tex]4.1*10^{22} *\frac {1 \ mol \ NaCl}{6.022*10^{23} }[/tex]
[tex]\frac {4.1*10^{22} \ mol \ NaCl}{6.022*10^{23} }[/tex]
[tex]0.06808369313 \ mol \ NaCl[/tex]
The original measurement of molecules has 2 significant figures, so our answer must have the same. For the number we calculated that is the thousandth place.
The 0 in the ten thousandth place tells us to leave the 8.
[tex]0.068 \ mol \ NaCl[/tex]
There are 0.068 moles of sodium chloride.
why does the pressure of gas increase due to inclement of heat
Answers
Answer:
When the gas is heated, the particles will gain kinetic energy which will make them move faster.
Explanation:
How does the entropy of a geyser system change as energy is added to the system ??
Answers
Answer:
Entropy increases as temperature increases. An increase in temperature means that the particles of the substance have greater kinetic energy. The faster moving particles have more disorder than particles that are moving more slowly at a lower temperature.
Explanation:
The entropy of the system increase as the temperature increase because at higher temperature there will be more randomness in the molecules.
What is entropy?Entropy can be described as a measure of spontaneous changes that take place in a system. In simpler words, entropy is the tendency of the universe towards disorder.
Entropy measures of randomness or disorder of a thermodynamic system and is represented by ‘S’. The value of entropy is dependent upon the amount of substance so it is an extensive property.
The change in the value of entropy depends on changes in quantities such as temperature, pressure, volume, and the number of moles of substance present in the system.
When the temperature of the system increases the kinetic energy of the molecules increases and they start to move faster. Therefore, the entropy of the geyser system increase as energy is added to the system.
Learn more about entropy, here:
https://brainly.com/question/13146879
#SPJ2
Compound X has a molar mass of 104.01 g.mol and the following composition:
element
mass %
nitrogen
26.93%
fluorine
73.07%
Write the molecular formula of X.
Answers
Answer: N2F4
Explanation:
What chemicals must be cycled through a Martian environment in order for the planet to be habitable for life? Describe how scientists intend to make those resources available in such a harsh environment.
Answers
A chemist determined by measurements that 0.0400 moles of potassium iodide participate in a chemical reaction. Calculate the mass of potassium iodide that participates. Be sure your answer has the correct number of significant digits.
Answers
Answer:
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Answer:
j
Explanation:
what is difference between dipole dipole interaction and hydrogen bonding
Answers
Answer:
A dipole-dipole force is when the positive side of a polar molecule attracts the negative side of another polar molecule.
A hydrogen bond is a dipole-dipole force and is an attraction between a slightly positive hydrogen on one molecule and a slightly negative atom on another molecule.
Answer:
Hydrogen bonds are dipole-dipole interactions in which at least one of the atoms involved is a hydrogen atom. Dipole-induced dipole bonds are those electric bonds that exist between a molecule with a permanent dipole moment and a molecule in which a temporary dipole moment has been induced.
at what temperature does water change from a liquid to a gas
Answers
Answer:
212 degrees
Explanation:
Answer:
212 degrees Fahrenheit
Explanation:
Similarly, if we heat a volume of water above 100 degrees Celsius, or 212 degrees Fahrenheit, water changes its phase into a gas called water vapor. Changes in the phase of matter are physical changes, not chemical changes.
answer for brainlist and extra points!!
Answers
Answer:D
Explanation:
1. How many valence electrons are in a molecule of Acetate?
a 2
b 6
c 5
d 1
2. If Acetate is part of an ionic bond, what will it's charge be?
a neutral
b negative
c positive
3. Will Acetate gain, lose, or share electrons in an ionic bond?
a share
b lose
c gain
4. In an ionic bond, how would Acetate be catagorized?
a anion
b cation
5 Is Acetatea metal, nonmetal, or polyatomic ion?
a metal
b nonmetal
c polyatomic ion
Answers
Answer:
the same amount of protons
7. Why would it be difficult to measure the rate of reaction for the rusting of iron?
Answers
Answer:
For rusting, it is difficult to write an equation due to the complexity of the reaction. Thus, we can express the reaction like the following. According to the law of conservation of mass, the increased mass of nail and rust is the amount of oxygen.
Explanation:
I hope this helps:)
How many moles are in 35.6 g of H2O
Answers
Answer:
Given
mass of H2O (m) =35.6g
molarmass (mr) = H2O ), 1x2+16=18g/mol
moles of H2O (n) =?
sln
n=m/mr
n=35.6g/18g/mol
n=1.978moles
the moles of H2O are 1.978moles
23) What is the chemical formula for carbon dioxide?
A CO2
B C2O
C CO2
D 2CO
Answers
1. Which type of matter has the molecules packed closer together?
a. Solid
b. Liquid
c. Gas
d. Plasma
2. Matter is made up of __________.
a. Molecules
b. Particles
c. Atom
d. All of them
3. Particles with more energy move ________ than particles with less
energy.
a. Slower and closer together
b. Slower and farther apart
c. Faster and farther apart
d. Faster and closer together
4. Which best describes the particles in a liquid?
a. More freely moving than a gas
b. More freely moving than a
solid
c. Less freely moving than a
solid
d. Completely unmoving
5. Which of the following statements describes a mass?
a. The force of attraction between two bodies.
b. The force of gravity exerts on a body of mass.
c. The amount of matter in an object.
d. The weight of the object from place to place.
Answers
Answer:
1. Which type of matter has the molecules packed closer together?
a. Solid
2. Matter is made up of _________.
d. All of them
3. Particles with more energy move ________ than particles with less
energy.
c. Faster and farther apart
4. Which best describes the particles in a liquid?
b. More freely moving than a solid
5. Which of the following statements describes a mass?
c. The amount of matter in an object.
If an atom contains one electron and one proton will it carry any charge or not?
Answers
Answer:
That atom will not contain any charge because one negative charge of single electron and one positive charge of single proton are neutralized by each other.
6. Which elkene will most likely have a very low boiling point?
A butane
B hexane
C pentane
D. propane
Answers
Answer:
D Propane
Explanation:
Very weak intermolecular forces between alkane MOLECULES AND IT'S COLOURLESS GASES IN ROOM TEMPERATURE
identify a pH value between 2.5 and 7.5 at which the concentration of the weak acid being titrated is less than the concentration of its conjugate base.
Answers
The acids do not completely dissociate in water. So, they tend to form a buffer system. Above pH 3.5, the concentration of the conjugate base is more than the concentration of the acid.
Weak acids: These are the acids that do not completely dissociate in water. So, they tend to form a buffer system.Buffers are used to resist a slight change in pH. The pH is equal to the pKa of the solution at equivalence.At equivalence, the concentration of weak acid and its conjugate base is equal.After the equivalence point, the concentration of the conjugate base is more than the concentration of the acid.
Therefore, after 3.5 the concentration of the conjugate base is more than the concentration of the acid.
Learn more about Buffer:
https://brainly.com/question/10468518
Which best explains why water has a high specific heat?
Answers
Answer:
The Presence of inter molecular hydrogen bonding makes it to heat at higher temperature as energy required to break them , hence the high specific heat
copper sulphate solution turns the colour of litmus into red but litmus changes into blue with baking soda solution although both are salts. Give reason why?
Answers
Answer:
Copper sulphate is an acidic salt: It is the product of the reaction between a weak copper base and a strong acid , H2SO4
Litmus has a red colour in acidic solutions:
Conclusion: Acidic copper sulphate solution turns blue litmus to red
Baking soda is a basic salt : It is the reaction product of a weak acid , CO2 and a strong base , NaOH
Litmus has a blue colour in basic solutions:
Conclusion: basic baking soda solution turns red litmus to blue
How many moles of gas are in a 30 liter scuba canister if the temperature
of the canister is 300 K and the pressure is 200 atmospheres?
Answers
Answer: the answer is n= 0.487 mol
Explanation: i took the test and got it right
Please help me ty! Correct answers only ty
Answers
Answer:
Ca(NO3)2 + Na2C2O4 ---> <---- Ca + 2NO3 + 2Na + C2O4
a two paragraph summary on how old is earth it's for science
Answers
Answer:
Explanation:
By dating the rocks in Earth's ever-changing crust, as well as the rocks in Earth's neighbors, such as the moon and visiting meteorites, scientists have calculated that Earth is 4.54 billion years old, with an error range of 50 million years
PLS HELP!!
Which of these processes are catabolic reactions? Check all that apply.
conversion of glycogen to glucose
conversion of glucose to stored lipid
bone growth
reduction reactions
breakdown of ATP to form ADP
Answers
Answer:
It's A) and E)
Explanation:
Did the assignment
Answer:
A. conversion of glycogen to glucose and
E. breakdown of ATP to form ADP
Explanation: I also did the assignment.