If Pulley A is 34% efficient and Pulley B is 85% efficient, what can we conclude? Which pulley would you rather use to lift a cement block?
Explain! This is science!!!
Answer:
I will use pulley b
Explanation:
because the pulley with more efficency can carry out the work better
The Second Law of Thermodynamics states that the overall entropy of the universe (or any other isolated
system) can never decrease. Identify the systems to which the Second Law of Thermodynamics would
apply
a reaction vessel that is completely sealed and insulated
an open beaker containing an aqueous solution
a sealed glass flask that is not insulated
the Earth
Answer:
apply
does not
does not
does not
Explanation:
The Second Law of Thermodynamics is applicable to only a reaction vessel that is completely sealed and insulated as the entropy remains constant during such chemical change.
What is a chemical change?
Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
Learn more about chemical change,here:
https://brainly.com/question/23693316
#SPJ2
Carol views a specimen under the microscope and notices that it has no nucleus. What
must she be looking at?
A. Animal cell
B. Plant cell
C. Bacteria
D. Protist
Answer:
Bacteria
Explanation:
Petrol used in cars is obtained by refining ?
Answer:
Crude oil is refined to make petrol (in America this is known as gasoline) or diesel. Most forms of transport use either petrol or diesel to power their engines - from lawnmowers, cars, buses and motorbikes to large ships and aeroplanes.
is there an ultimate particle?
Answer:
We learn in school that matter is made of atoms and that atoms are made of smaller ingredients: protons, neutrons and electrons. Protons and neutrons are made of quarks, but electrons aren’t. As far as we can tell, quarks and electrons are fundamental particles, not built out of anything smaller.
Answer:
The recent discovery declared that the finding is very close to the ultimate particle called Higgs particle. This is believed to be the basic building block of the universe.
Explanation: hope this help
the number of moles of
480 dm3 of He
Answer:
286
Explanation:
see ur periodic table
Which elements in the image are likely
to lose electrons in an ionic bond
A. neon and chlorine
B. calcium and
potassium. C.neon and
potassium
D. There is not enough information to tell
what is the shape of graphite
Answer:
The molecular formula lists the symbol of each element within the compound followed by a number (usually in subscript). The letter and number indicate how many of each type of element are in the compound. If there is only one atom of a particular element, then no number is written after the element.
is h2o a pure element or a compound
Which characteristic of planets depends upon its distance from the Sun?
Answer:
I think its the length of its year
Answer:
the length of its year
Explanation:
Calculate the mass of 5.22 mol of He.
Answer:
The mass is 20, 89 grams of He.
Explanation:
We calculate the weight of 1 mol of He, from the atomic weight of each element obtained from the periodic table: Weight 1 mol He= 4, 0020602 g. 1 mol He-----4, 0020602 g. 5,22 mol He---x= (5,22 mol He x4, 0020602 g)/ 1 mol He= 20, 89 g
hope this helps also can i get brainliest
The mass of 5.22 mol of He will be 20.84 grams.
We have 5.22 mol of He.
We have to calculate its Mass.
Which element is represented by symbol He ?Helium is a chemical element with the symbol He and atomic number 2. It is a gas which is colorless, odorless, tasteless, non-toxic, inert and monatomic.
According to the question -
Number of moles of Helium = 5.22 mol
Now, I mole of Helium will have its mass equal to its Atomic weight. Therefore -
Mass of 1 mole of He = 4.002602 g
So, the mass of 5.2 mol of He will be = 5.2 x 4.002602 = 20.84 grams
Hence, the mass of 5.22 mol of He will be 20.84 grams.
To solve more questions on Mole concept, visit the link below-
https://brainly.com/question/15374113
#SPJ2
is gold an example of a metal or nonmetal
Answer:
Gold is a metal lol
Explanation:
Chemically, gold is a transition metal and a group 11 element
Which of the following correctly shows the bond polarity?
please help me asap!
c. H-I>Se-N>Cl-F
that is the answer i think...
What's the correct name for Pt3N5
Answer:Phosphate
Explanation:It is called phosphate because of this higher state (otherwise it would be called phosphite and be PO3+3 ).
Help me please. I need to find the name of the oxides of the elements (N2O, SO3, Li2O, CO2, Al2O3, Cl2O, SO2, CrO3, MgO, CI2O5, K2O, BaO)
Answer:
Nitrous oxide,Sulfur trioxide, Lithium oxide, Lithium oxide,Aluminium oxide, Dichlorine monoxide, Sulfur dioxide, Chromium trioxide, Magnesium oxide,Dichlorine Pentoxide, Potassium oxide, Barium oxide
Explanation:
Which industry would most likely be affected if coal recourses were depleted.
1.Power production
2.Transportation
3.construction
Help! 7th Grade Math!
A triple beam balance measures the ______ of an object in ______.
A
mass, grams
B
volume, liters
C
temperature, Fahrenheit
D
length, meters
Answer:
D
Explanation: Trust me
The triple beam balance measures the mass of an object in grams.
Explanation:
A triple beam balance is an instrument used in labs to measure the mass of a substance or an object.It measures the mass in units of grams.It consists of three beams with a different set of increments in grams. which are:Middle beam = Increments of 100 grams
Front beam = Increments from 0 grams to 10 grams
Farther beam = Increments of 10 grams
So, from this, we can conclude that the triple beam balance measures the mass of an object in grams. Hence the correct answer is option A.
Learn more about triple beam balance here:
https://brainly.com/question/12149442
True or False Friction can be reduced by lubricating or changing the shape of objects
Answer:
True
Explanation:
If you cover cup in soap it will be a lot more slippery than it was before, if you reshaped a car wheel to have less treads then it would have much less friction.
PLZ HELP
In this activity, you’ll conduct research about the savanna biome, a type of grassland. Use credible websites to gather information on these points:
the location of the savanna on Earth
the conditions in the savanna (temperature, precipitation, etc.)
the living things that make up this ecosystem (Identify all forms: plants, prey animals, and predators, for example.)
the nonliving components that make up the environment
After you’ve completed your research, answer the following questions.
Part A
Summarize your research, and describe the attributes of the savanna.
Answer:
Savannas are grasslands found in Africa, Australia, South America, and India. The climate is warm or hot. Savannas experience both dry and rainy seasons. Each year, savannas receive about 20 to 50 inches of rain in a span of six to eight months. The other months are dryer. There’s also a threat of wildfires because of the severe dryness during these months. Grasslands are true to their name because their vegetation is mostly grass. Savannas are home to a wide range of animals, including different species of beetles and insects, which many creatures consume. Squirrels, mice, elephants, gazelles, and antelopes are the plant-eating animals that live in the savanna. Hyenas, lions, and leopards are some of the meat-eating animals in these areas. Some of the nonliving components of the system include very porous soil that allows water to drain easily.
Explanation:
this is the edmentum answer :)
How do ionic bonds differ from covalent bonds? I NEED HELP QUICK PLSSS!!!!!
Answer:
.
Explanation:
Answer:
Ionic bonds are usually between a metal and a nonmetal and involve the transfer of electrons. Covalent bonds are typically between two nonmetals and involve the sharing of electrons.
Explanation:
When elements bond together ionically, they transfer their valence electrons to another element to satisfy the octet rule and create full shells of 8 electrons. Metals usually have low electronegativity and ionization energy and can more easily give up an electron to a nonmetal with higher electronegativity and ionization energy.
When two nonmetals bond, their electronegativities are close enough in magnitude that neither element can "claim" the valence electrons, so the electrons orbit back and forth between the elements in the bond.
define adhesion and give an example?
Similar to Cohesion, adhesion is the attraction between molecules of different substances . Water uses adhesion when it's attraction to another substance is greater than the water's attraction to itself. if you have ever dropped a cup of water on a hardwood floor,you know that it spreads out instead of foaming beads.
In the photo, what does the green line with the arrow represent?
M
Answer:
if im not mistaken that's a jetstream
Josh used several different liquid chemicals for an experiment in his chemistry class. After completing the experiment, the chemicals were no longer usable. Josh carefully poured each chemical into a bottle marked "Waste" and placed the lid back on the bottle. Did Josh use the correct procedure?
A.
No; different types of chemical waste should not be mixed together.
B.
No; the chemicals should have been poured down the sink.
C.
No; the chemicals should have been poured into the trash can.
D.
Yes; the chemicals were stored in the proper place.
Which statement BEST describes electromagnetic and mechanical waves?
A.
Electromagnetic waves and mechanical waves both do not require a medium.
B.
Mechanical waves require a medium and electromagnetic waves do not.
C.
Electromagnetic waves require a medium and mechanical waves do not.
D.
Mechanical waves and electromagnetic waves both require a medium.
Answer:
C I believe
Explanation:
9. If 1,785 cal of heat is added to a 343 g sample of water (specific heat = 4.18J/g °C) at 1202,
what is the *final temperature of the water? *
(1 Point)
15.76°C
031'c
18.24°C
1.24°C
Answer:
17.21°C
Explanation:
Using the following formula;
Q = m × c × ∆T
Where;
Q = amount of heat in joules
m = mass of substance in grams
c = specific heat capacity of water (4.184 J/g°C)
∆T = final temperature - initial temperature
According to the information provided in this question,
Q = 1,785 cal
1 cal = 4.184 J
1785 cal = 7468.4J
m = 343grams
c = 4.18J/g °C
initial temperature = 12°C
Using Q = m × c × ∆T
7468.4 = 343 × 4.18 × (T - 12)
7468.4 = 1433.74(T - 12)
7468.4 = 1433.74T - 17204.88
7468.4 + 17204.88 = 1433.74T
24673.28 = 1433.74T
T = 24673.28 ÷ 1433.74
T = 17.21°C
How many moles of gas are in a 30 liter compressed air tank if the
temperature of the tank is 300K and the pressure is 200 atmospheres? *
Answer:
B
Explanation:
The the _____ temperature _____ the the air molecules move. (Choose 2) higher, faster lower, faster lower, slower higher, slower
Answer:
The higher the temperature the faster the air molecules move. / The lower the temperature the slower the air molecules move.
Explanation:
Both answers work. Higher temp = more energy = moving faster, and the opposite applies. Lower temp = less energy = moving slower.
Identify the following as an element or compound: sucrose/sugar (C12 H22 O11)
Answer:
Explanation:
its a compound
Please help me ASAP!!
Chemistry
Based on the information in the table, which of the following arranges the bonds in order of decreasing polarity?
Answer:
F,Cl,N,I,Se,H
Explanation:
polarity increases as electronegativity increases i guess so that is supposed to be the answer
True or false: Breaking down water into the elements hydrogen and oxygen is an example of a chemical change.
Answer:
True.
Explanation:
When water is decomposed into hydrogen and oxygen, chemical bonds are broken, chemical energy is released, and two new substances are formed from one.