Homework answers and tutorials

Waiting for answer Water sprinkler used for grass lawns begins to rotate as so...
Newton's third law: For every action, there is an equal and opposite reaction. This means that if object A exerts a force on object B, object B exerts an equal force in the opposite...
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Waiting for answer Why is mitosis important in the repair and growth of tissue?
It is the duplication of a cell into two identical cells, which, naturally, replaces tissue. When tissue is damaged, it has to be replaced quickly. Your cells receive the message tha...
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Waiting for answer What is the duet rule?
The duet rule states that hydrogen and helium may have no more than two electrons in their valence shells. The rule comes from quantum mechanics, which says that the lowest energy level (n = 1) of an atom can contain only two electrons. The duet rule applies to H and He, because they are the first...
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Waiting for answer How do you calculate the antiderivative of ##sin(2x)/cos(x)...
The integral/antiderivative you require is ##I = intsin(2x)/cos(x)dx## The easiest way to solve it is to use trigonometric identities and expand the numerator, like this ##sin(2x) = 2sinxcosx## This transforms the integral in this way ##I = int2sinxcosx/cosxdx## ##= I = 2intsinxdx## ##= I = ...
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Waiting for answer How is radiation different from conduction and convection?
Radiation is a form of heat transfer just like convection and conduction, but it does NOT require a medium. Radiation is simply another term for light waves (not necessarily visible light), so we can transfer heat by using EM radiation, such as a microwave oven, or using a magnifying glass and focu...
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Waiting for answer Spencer bought 3 books of stamps and mailed a package. It co...
Cost = ##$3x + $4.50## We do not know the cost of each book of stamps, but whatever it was, Spencer bought 3 of them. Let's call the value we don't know, ##$x##. The money spent o...
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Waiting for answer What is the circumference of a circle with a radius of 9 cm?...
##=56.52cm## The formula for the circumference of a circle is ##=2 pi r## The radius ##=9 cm## circumference ##=2 pi r## ##=2 xx 3.14 xx 9## ##=6.28 xx 9## ##=56.52cm##
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Waiting for answer From the top of a lighthouse 55 ft above sea level, the angl...
Let ##a## be the altitude of the lighthouse above sea level, ##a=55 ft## and ##b## the distance of the boat from the foot of the lighthouse, ##thetad = 11.3^0## Solution: ##tan11.3^0 = 55/x## ##x = 55/(tan11.3^o) = 55/(0.19982)= 275.25 ft.  Answer ##
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Waiting for answer What is the limit of the greatest integer function?
See explanation... The "greatest integer" function otherwise known as the "floor" function has the following limits: ##lim_(x +oo) floor(x) = +oo## ##lim_(x oo) floor(x) = oo#...
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Waiting for answer How do you find the six trigonometric functions of 300 degre...
Use the trig unit circle as proof. ##sin 300 = sin (60 + 360) = sin (60) = sin 60 =#### (sqrt3)/2## ##cos 300 = cos (60 + 300) = cos 60 = 1/2## ##tan 300 = (sqrt3)/2 : (1/2) = sqrt3## ##cot 300 = 1/(sqrt3) = (sqrt3)/3## ##sec 300 = 1/cos 300 = 2/(sqrt3) = (2sqrt3)/3## ##csc 300 = 1/s...
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Waiting for answer How many constitutional isomers are possible for the formula...
There are four possible constitutional isomers of ##"C"_4"H"_9"Cl"##. First draw all the constitutional isomers of ##"C"_4"H"_10##. You get (from hardinars.tk) and Then put a...
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Waiting for answer What are some examples of rotifers?
There are over 2,000 of rotifers and virtually every genus contains species with strange characteristics. Most are females and very few are males. These "wheel animalcules" dates back nearly three centuries to their first description in 1703 by Leeuwenhoek. Some examples are: Euchlanis Asplan...
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Waiting for answer Which is the strongest acid among these: ##HBr##, ##HF##, ##...
Acidity increases in the order: ##HF, HCl, HBr, HI##. Note that in water dissociation is fairly complete. Acidity may be related to the reaction: ##HA rightleftharpoonsH^+ + A^#...
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Waiting for answer What does supplementary mean?
The question, most likely, is about supplementary angles. Two angles are called supplementary if a sum of their measures equals to ##180^o## (in degrees) or ##pi## radians. On a pict...
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Waiting for answer What are the fat soluble vitamins? What makes them soluble?
The fatsoluble vitamins are Vitamins A, D, E, and K. Here are their structures. Vitamin A Vitamin D Vitamin E Vitamin K Why are they fatsoluble? Here is the st...
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Waiting for answer 5. Lithium nitride has the chemical formula ##Li_3N##. Rubid...
We would assume ##Rb_3N##. Rubidium, an alkali metal, commonly forms ##Rb^+## salts, just as lithium commonly forms ##Li^+## salts. We would assume that the formula of rubidium nitr...
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Waiting for answer How many atoms are there in 1 mole of H2O, and how would you...
A mole refers to ##6.022 x 10^23## items. ##H_2O## has 2 hydrogen atoms and 1 oxygen atom...so a total of 3 atoms in each ##H_2O##. Therefore ##(6.022 x 10^23)x ## (3 atoms) ##=18.066 x 10^23## Then we need to change the answer into proper : ##18.066 x 10^23 = 1.8066 x 10^24## Lastly, change t...
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Waiting for answer How does a hydrolysis reaction separate a polymer into its m...
By reintroducing water, breaking the covalent bond, and reattaching the ##"H"## and ##"OH"## to the monomers that made up the polymer. This works only for condensation polymers ,...
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Waiting for answer What is activation energy in a chemical reaction and what ha...
Activation Energy and Bond energy Activation energy is the energy required for any molecule to take part or initiate the reaction. Bond energy is the energy given out or taken in when the bond between molecules or atoms are split. Activation energy is required for all reactions to proceed natura...
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Waiting for answer What is the polymer and monomer for lipids?
Polymer Monomersfatty acids Polymers are made of monomers. Lipids are made of fatty acids.
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